Red

The OPTIMA RedTop RT R 3.7 is a revolutionary high-performance starter battery that delivers maximum starting power in a compact and extremely robust housing thanks to the patented SPIRALCELL TECHNOLOGY®. With a nominal voltage of 12 V and an enormous cold-start current of 730 A, it is the ultimate solution for demanding vehicles that require a reliable and powerful start in all conditions. Its extreme vibration resistance and absolutely maintenance-free, leak-proof construction make it the first choice for hot rods, off-road vehicles, agricultural machinery and all vehicles that need more than just an ordinary battery.Highlights at a glanceMaximum starting power: Offers the highest possible starting performance for a reliable engine start even at extreme temperatures.SPIRALCELL TECHNOLOGY®: Unique spiral cell design for extreme vibration resistance and a longer service life.Extreme vibration resistance: Up to 15 times more vibration-resistant than conventional batteries, ideal for tough off-road use or strong vibrations.Absolutely maintenance-free and leak-proof: The sealed AGM construction allows installation in almost any position.Long service life: Lasts up to three times longer than a conventional starter battery.Maximum performance for demanding vehiclesThe OPTIMA RedTop RT R 3.7 was specifically developed for the extreme demands of high-performance vehicles, whose primary requirement is a powerful starting impulse. It is the ideal choice for trucks, SUVs, hot rods, classic cars and construction vehicles. Even during seasonal use or after long periods of inactivity, it reliably supplies the necessary energy to start large engines effortlessly. Its compact design and high power density also make it the perfect solution for vehicles with limited installation space.Superior SPIRALCELL TECHNOLOGY®At the heart of every OPTIMA battery is the unique SPIRALCELL TECHNOLOGY®. Instead of flat lead plates, high-purity lead spirals are used, wrapped in a glass fibre fleece (AGM). This compact and extremely robust design minimises plate spacing, maximises the active surface area and reduces internal resistance. The result is unmatched starting performance that can consistently be called upon even under the toughest conditions.Built for the most demanding conditionsThe OPTIMA RedTop is designed for tough use. Its sealed construction not only prevents acid leakage, but also evaporation, making it absolutely maintenance-free. The rugged construction made from impact-resistant polypropylene and the extreme vibration resistance ensure that vibrations and shocks during demanding driving conditions cannot harm the battery. Features  ModelOPTIMA RedTop RT R 3.7 TechnologyAGM Spiralcell Nominal voltage (V)12 Capacity (Ah)44 Cold start current EN (A)730 Dimensions (L x W x H in mm)245 x 172 x 194 ConnectionSAE Autopole (positive terminal right) Weight (kg)approx. 14.7  FAQs about the OPTIMA RedTop batteryWhat is the main advantage of SPIRALCELL TECHNOLOGY®?The spiral cell technology provides an extremely robust and vibration-resistant internal structure, a very low internal resistance for highest starting currents and a longer service life compared to traditional batteries with flat plates. It is optimised for maximum starting performance.What is the difference between OPTIMA RedTop, YellowTop and BlueTop?RedTop: A pure high-performance starter battery for maximum starting power. Ideal for vehicles where the start process is the main load. YellowTop: A dual-purpose battery (starting and supply) for vehicles with high energy demand due to additional consumers (e.g. winch, large hi-fi systems). BlueTop: Specialist for marine and leisure vehicles, available as a pure starter battery or as a dual-purpose battery.Is this battery suitable for vehicles with many electrical consumers?The RedTop is primarily a starter battery. If your vehicle, in addition to starting, also has extensive equipment such as powerful hi-fi systems, auxiliary headlights or a winch that are operated when stationary, an OPTIMA YellowTop or BlueTop (Dual Purpose) is the better choice, as these are designed for deep discharge cycles.Which charger do I need for this AGM battery?For AGM batteries, especially for OPTIMA batteries, a modern, microprocessor-controlled charger is recommended that has a special charging characteristic for AGM batteries. This ensures a complete and gentle charge and maximises lifetime.How should this lead-acid battery be disposed of?Lead-acid batteries contain environmentally hazardous substances and must not be disposed of in household waste. You can return your old battery free of charge to any retailer that sells new batteries, or at municipal recycling centres, to ensure proper recycling.

The OPTIMA RedTop RT U 4.2 is a revolutionary high-performance starter battery that delivers maximum starting power in a compact and extremely robust housing thanks to the patented SPIRALCELL TECHNOLOGY®. With a nominal voltage of 12 V and an enormous cold starting current of 815 A, it is the ultimate solution for demanding vehicles that require a reliable and powerful start under all conditions. Its extreme vibration resistance and absolutely maintenance-free, leak-proof design make it the first choice for hot rods, off-road vehicles, agricultural machinery and all vehicles that need more than just an ordinary battery.Highlights at a glanceMaximum starting power: Offers the highest possible starting performance for reliable engine starts even at extreme temperatures.SPIRALCELL TECHNOLOGY®: Unique spiral cell design for extreme vibration resistance and longer service life.Extreme vibration resistance: Up to 15 times more vibration-resistant than conventional batteries, ideal for rough off-road use or heavy vibrations.Absolutely maintenance-free and leak-proof: The sealed AGM design allows installation in almost any position.Long service life: Lasts up to three times longer than a conventional starter battery.Maximum performance for demanding vehiclesThe OPTIMA RedTop RT U 4.2 has been specifically developed for the extreme demands of high-performance vehicles whose main requirement is a powerful starting impulse. It is the ideal choice for trucks, SUVs, hot rods, classic cars and construction machinery. Even in seasonal use or after longer periods of downtime, it reliably provides the necessary power to start large engines effortlessly. Its compact design and high power density also make it the perfect solution for vehicles with limited installation space.Superior SPIRALCELL TECHNOLOGY®The heart of every OPTIMA battery is the unique SPIRALCELL TECHNOLOGY®. Instead of flat lead plates, highly pure lead spirals wrapped in glass fibre fleece (AGM) are used. This compact and extremely stable design minimises plate spacing, maximises the active surface area and reduces internal resistance. The result is unrivalled starting performance, which can be constantly achieved even under the toughest conditions.Built for the most demanding conditionsThe OPTIMA RedTop is engineered for tough use. Its sealed construction not only prevents acid leakage but also evaporation, making it completely maintenance-free. The robust construction made from impact-resistant polypropylene and its extreme vibration resistance ensure that the battery can withstand vibrations and shocks from demanding driving. Features  ModelOPTIMA RedTop RT U 4.2 TechnologyAGM Spiralcell Nominal voltage (V)12 Capacity (Ah)50 Cold starting current EN (A)815 Dimensions (L x W x H in mm)254 x 175 x 200 ConnectionSAE car pole (positive pole left) Weight (kg)approx. 17.6  FAQs about the OPTIMA RedTop batteryWhat is the main advantage of SPIRALCELL TECHNOLOGY®?The spiral cell technology ensures an extremely robust and vibration-resistant internal structure, a very low internal resistance for maximum starting currents and a longer lifespan compared to traditional batteries with flat plates. It is optimised for maximum starting performance.What is the difference between OPTIMA RedTop, YellowTop and BlueTop?RedTop: A pure high-performance starter battery for maximum starting power. Ideal for vehicles where the starting process is the main load. YellowTop: A dual-purpose battery (starting and supply) for vehicles with high energy requirements due to additional consumers (e.g. winch, large hi-fi systems). BlueTop: Specialist for marine and leisure vehicles, available as a pure starter battery or as a dual-purpose battery.Is this battery suitable for vehicles with many electrical consumers?The RedTop is primarily a starter battery. If your vehicle, in addition to starting, is also equipped with comprehensive features such as powerful hi-fi systems, auxiliary headlights or a winch that are operated when stationary, an OPTIMA YellowTop or BlueTop (dual purpose) is the better choice, as these are designed for deep discharge cycles.Which charger do I need for this AGM battery?For AGM batteries, especially OPTIMA batteries, a modern, microprocessor-controlled charger is recommended that has a special charging curve for AGM batteries. This ensures complete and gentle charging and maximises lifespan.How should this lead-acid battery be disposed of?Lead-acid batteries contain environmentally harmful substances and must not be disposed of with household waste. You can return your old battery to any retailer that sells new batteries, or to municipal recycling centres free of charge to ensure proper recycling.

The OPTIMA RedTop RT C 4.2 is a revolutionary high-performance starter battery that delivers maximum starting power in a compact and extremely robust housing thanks to the patented SPIRALCELL TECHNOLOGY®. With a nominal voltage of 12 V and an enormous cold start current of 815 A, it is the ultimate solution for demanding vehicles that require a reliable and powerful start in all conditions. Its extreme vibration resistance and absolutely maintenance-free, leak-proof design make it the first choice for hot rods, off-road vehicles, agricultural machinery and all vehicles that need more than just an ordinary battery.Highlights at a glanceMaximum starting power: Offers the highest possible starting power for reliable engine starting even in extreme temperatures.SPIRALCELL TECHNOLOGY®: Unique spiral cell design for extreme vibration resistance and a longer service life.Extreme vibration resistance: Up to 15 times more vibration resistant than conventional batteries, ideal for tough off-road use or heavy vibrations.Absolutely maintenance-free and leak-proof: The sealed AGM design allows installation in almost any position.Long service life: Lasts up to three times longer than a conventional starter battery.Maximum performance for demanding vehiclesThe OPTIMA RedTop RT C 4.2 has been specifically developed for the extreme requirements of high-performance vehicles whose main requirement is a powerful starting impulse. It is the ideal choice for trucks, SUVs, hot rods, classic cars, and construction vehicles. It reliably provides the required energy to easily start large engines even during seasonal use or after long periods out of service. Its compact design and high power density also make it the perfect solution for vehicles with limited installation space.Superior SPIRALCELL TECHNOLOGY®The heart of each OPTIMA battery is the unique SPIRALCELL TECHNOLOGY®. Instead of flat lead plates, high purity lead spirals are used which are wrapped in a fibreglass mat (AGM). This compact and extremely stable design minimises plate spacing, maximises the active surface, and reduces internal resistance. The result is unmatched starting performance which can be delivered consistently even under the harshest conditions.Built for the most demanding conditionsThe OPTIMA RedTop is designed for the toughest use. Its sealed construction not only prevents acid leaks but also evaporation, making it completely maintenance-free. The robust construction from impact-resistant polypropylene and the extreme vibration resistance ensure that vibrations and shocks cannot affect the battery in demanding driving conditions. Features  ModelOPTIMA RedTop RT C 4.2 TechnologyAGM Spiralcell Nominal voltage (V)12 Capacity (Ah)50 Cold start current EN (A)815 Dimensions (L x W x H in mm)254 x 175 x 200 ConnectionSAE car pole Weight (kg)approx. 17.6  FAQs about the OPTIMA RedTop BatteryWhat is the main advantage of SPIRALCELL TECHNOLOGY®?The spiral cell technology ensures an extremely robust and vibration-resistant inner structure, a very low internal resistance for maximum starting currents, and a longer life compared to traditional batteries with flat plates. It is optimised for maximum starting performance.What is the difference between OPTIMA RedTop, YellowTop and BlueTop?RedTop: A pure high-performance starter battery for maximum starting power. Ideal for vehicles where the starting process is the main load. YellowTop: A dual-purpose battery (starting and supply) for vehicles with high energy requirements due to additional consumers (e.g. winch, large hi-fi systems). BlueTop: Specialist for marine and leisure vehicles, available as a pure starter battery or as a dual-purpose battery.Is this battery suitable for vehicles with many electrical consumers?The RedTop is primarily a starter battery. If your vehicle, in addition to starting, also has extensive equipment such as powerful hi-fi systems, additional headlights or a winch which is operated when stationary, an OPTIMA YellowTop or BlueTop (Dual Purpose) is the better choice, as these are designed for deep discharge cycles.Which charger do I need for this AGM battery?For AGM batteries, especially for OPTIMA batteries, a modern microprocessor-controlled charger is recommended, which has a special charging curve for AGM batteries. This ensures complete and gentle charging, and maximises service life.How should this lead-acid battery be disposed of?Lead-acid batteries contain environmentally harmful substances and must not be disposed of in household waste. You can return your old battery free of charge to any dealer selling new batteries or to municipal recycling centres to ensure professional recycling.

The OPTIMA RedTop RT S 2.1 is a revolutionary 6-volt high-performance starter battery that, thanks to patented SPIRALCELL TECHNOLOGY®, delivers maximum starting power in a compact and extremely rugged case. With a nominal voltage of 6 V and an enormous cold cranking current of 800 A for this class, it is the ultimate solution for classic vehicles and demanding applications that require a reliable and powerful 6-volt energy source. Its extreme vibration resistance and absolutely maintenance-free, leakproof design make it the first choice for classic cars, hot rods and tractors.Highlights at a glanceMaximum 6V starting power: Offers the highest possible starting performance for reliable engine starts, even in large-displacement 6-volt engines.SPIRALCELL TECHNOLOGY®: Unique spiral cell construction for extreme vibration resistance and a longer service life.Extreme vibration resistance: Up to 15 times more vibration-resistant than conventional batteries, ideal for use in older vehicles without modern suspension.Absolutely maintenance-free and leakproof: The sealed AGM construction allows installation in almost any position and prevents paint damage caused by acid leakage.Long service life: Lasts up to three times longer than a conventional 6-volt starter battery.Maximum performance for classic vehiclesThe OPTIMA RedTop RT S 2.1 was specifically developed to bring the performance and reliability of modern technology to classic 6-volt vehicles. It is the ideal choice for classic cars, classic vehicles, hot rods and historic agricultural vehicles, which often have engines that are difficult to start. Even after longer periods of inactivity, as is typical for collector's vehicles, it reliably supplies the necessary power for an effortless start.Superior SPIRALCELL TECHNOLOGY®At the heart of every OPTIMA battery is the unique SPIRALCELL TECHNOLOGY®. Instead of flat lead plates, high-purity lead spirals are used, wrapped in glass fiber fleece (AGM). This compact and extremely stable design minimizes plate spacing, maximizes active surface area and reduces internal resistance. The result is unrivaled starting performance that can be consistently delivered even under the harshest conditions.Built for the most demanding conditionsThe OPTIMA RedTop is designed for tough use. Its sealed construction not only prevents acid leakage, which is especially important in valuable classics, but also evaporation, making it absolutely maintenance-free. The rugged construction made of impact-resistant polypropylene and the extreme vibration resistance ensure that vibrations and shocks cannot harm the battery. Features  ModelOPTIMA RedTop RT S 2.1 TechnologyAGM Spiralcell Nominal voltage (V)6 Capacity (Ah)50 Cold cranking current EN (A)815 Dimensions (L x W x H in mm)254 x 90 x 206 ConnectionSAE-Autopol Weight (kg)approx. 8.5  FAQs about the OPTIMA RedTop 6V batteryWhat is the main advantage of SPIRALCELL TECHNOLOGY® in a classic car?In classic vehicles, spiral cell technology offers two decisive advantages: first, extreme vibration resistance, which is of great benefit in older chassis. Secondly, it is absolutely leakproof, which protects valuable paint and body parts from acid damage, a common problem with old wet batteries.What is the difference between OPTIMA RedTop, YellowTop and BlueTop?RedTop: A pure high-performance starter battery for maximum starting power. Ideal for vehicles where starting is the main load. YellowTop: A 12-volt dual-purpose battery (starting and supplying) for vehicles with high energy requirements due to additional consumers. BlueTop: A 12-volt special battery for marine and leisure vehicles.Do I need a special charger for this 6V AGM battery?Yes, it is very important to use a modern, microprocessor-controlled charger that is suitable for both 6 volts and AGM technology. Old, unregulated 6-volt chargers can damage the battery due to overvoltage.Can this battery be deeply discharged?The RedTop is designed as a pure starter battery and should not be deeply discharged, as this can shorten its service life. For applications where power is regularly required for consumers at a standstill (e.g. a music system), a YellowTop or BlueTop battery (which are only available in 12V) would be the right choice.How should this lead-acid battery be disposed of?Lead-acid batteries contain environmentally harmful substances and must not be disposed of in household waste. You can return your old battery free of charge to any retailer selling new batteries or municipal recycling centers to ensure proper recycling.

The OPTIMA RedTop RT S 4.2 is a revolutionary high-performance starter battery that, thanks to the patented SPIRALCELL TECHNOLOGY®, delivers maximum starting power in a compact and extremely robust case. With a rated voltage of 12 V and an enormous cold cranking current of 815 A, it is the ultimate solution for demanding vehicles that require reliable and powerful starting under all conditions. Its extreme vibration resistance and absolutely maintenance-free, spillproof construction make it the first choice for hot rods, off-road vehicles, agricultural machinery, and all vehicles that need more than just an ordinary battery.Highlights at a glanceMaximum starting power: Offers the highest possible starting performance for reliable engine starting even in extreme temperatures.SPIRALCELL TECHNOLOGY®: Unique spiral cell construction for extreme vibration resistance and a longer service life.Extreme vibration resistance: Up to 15 times more vibration-resistant than conventional batteries, ideal for tough off-road use or heavy vibration.Absolutely maintenance-free and spillproof: The sealed AGM construction allows installation in almost any position.Long service life: Lasts up to three times longer than a conventional starter battery.Maximum performance for demanding vehiclesThe OPTIMA RedTop RT S 4.2 was specifically developed for the extreme requirements of high-performance vehicles whose main requirement is a powerful starting impulse. It is the ideal choice for trucks, SUVs, hot rods, classic cars and construction vehicles. Even with seasonal use or longer downtimes, it reliably provides the necessary power to effortlessly start large engines. Its compact design and high power density also make it the perfect solution for vehicles with limited installation space.Superior SPIRALCELL TECHNOLOGY®At the core of every OPTIMA battery is the unique SPIRALCELL TECHNOLOGY®. Instead of flat lead plates, high-purity lead spirals are used, wrapped in a glass fibre mat (AGM). This compact and extremely stable design minimises plate spacing, maximises the active surface and reduces internal resistance. The result is unsurpassed starting performance that can be delivered consistently even under the toughest conditions.Built for the most demanding conditionsThe OPTIMA RedTop is designed for tough use. Its sealed construction not only prevents acid leakage, but also evaporation, making it completely maintenance-free. The robust design made from impact-resistant polypropylene and the extreme vibration resistance ensure that vibrations and shocks during demanding driving have no effect on the battery. Features  ModelOPTIMA RedTop RT S 4.2 TechnologyAGM Spiralcell Rated voltage (V)12 Capacity (Ah)50 Cold cranking current EN (A)815 Dimensions (L x W x H in mm)254 x 175 x 200 ConnectionSAE Autopole & side terminals Weight (kg)approx. 17.6  FAQs about the OPTIMA RedTop batteryWhat is the main advantage of SPIRALCELL TECHNOLOGY®?The spiral cell technology ensures an extremely robust and vibration-resistant internal structure, a very low internal resistance for maximum starting currents and a longer lifespan compared to conventional batteries with flat plates. It is optimised for maximum starting performance.What is the difference between OPTIMA RedTop, YellowTop and BlueTop?RedTop: A pure high-performance starter battery for maximum starting power. Ideal for vehicles where starting is the main load. YellowTop: A dual-purpose battery (starting and supply) for vehicles with high energy needs due to additional consumers (e.g. winch, large hi-fi systems). BlueTop: Specialist for marine and leisure vehicles, available as a pure starter battery or as a dual-purpose battery.Is this battery suitable for vehicles with many electrical consumers?The RedTop is primarily a starter battery. If your vehicle, in addition to starting, also has extensive equipment such as powerful hi-fi systems, additional spotlights or a winch that are used when stationary, an OPTIMA YellowTop or BlueTop (dual purpose) is the better choice as they are designed for deep discharge cycles.Which charger do I need for this AGM battery?For AGM batteries, especially for OPTIMA batteries, a modern, microprocessor-controlled charger is recommended that has a special charging curve for AGM batteries. This ensures complete and gentle charging and maximises service life.How should this lead-acid battery be disposed of?Lead-acid batteries contain harmful substances and must not be disposed of with household waste. You can return your old battery free of charge to any retailer who sells new batteries or to municipal recycling centres to ensure proper recycling.

The OPTIMA RedTop RT S 4.2 is a revolutionary high-performance starter battery that delivers maximum starting power in a compact and extremely robust housing thanks to the patented SPIRALCELL TECHNOLOGY®. With a nominal voltage of 12 V and a massive cold start current of 815 A, it is the ultimate solution for demanding vehicles that require a reliable and powerful start under all conditions. Its extreme vibration resistance and absolutely maintenance-free, leak-proof construction make it the first choice for hot rods, off-road vehicles, agricultural machinery and all vehicles that need more than just an ordinary battery.Highlights at a glanceMaximum starting power: Offers the highest possible starting performance for reliable engine starting even in extreme temperatures.SPIRALCELL TECHNOLOGY®: Unique spiral cell construction for extreme vibration resistance and longer service life.Extreme vibration resistance: Up to 15 times more vibration resistant than conventional batteries, ideal for tough off-road use or strong vibrations.Absolutely maintenance-free and leak-proof: The sealed AGM construction allows installation in almost any position.Long service life: Lasts up to three times longer than a conventional starter battery.Maximum performance for demanding vehiclesThe OPTIMA RedTop RT S 4.2 was specifically developed for the extreme demands of high-performance vehicles, whose main requirement is a powerful starting impulse. It is the ideal choice for trucks, SUVs, hot rods, classic cars and construction vehicles. Even in seasonal use or after long periods of downtime, it reliably provides the necessary power to start large engines effortlessly. Its compact design and high power density also make it the perfect solution for vehicles with limited installation space.Superior SPIRALCELL TECHNOLOGY®At the core of every OPTIMA battery is the unique SPIRALCELL TECHNOLOGY®. Instead of flat lead plates, high-purity lead spirals are used, which are wrapped in a glass fibre mat (AGM). This compact and extremely robust design minimises the plate spacing, maximises the active surface area and reduces internal resistance. The result is unrivalled starting performance that can be delivered consistently even under the toughest conditions.Built for the most demanding conditionsThe OPTIMA RedTop is designed for tough use. Its sealed construction not only prevents acid leakage but also evaporation, making it absolutely maintenance-free. The robust construction made of impact-resistant polypropylene and the extreme vibration resistance ensure that vibrations and shocks in demanding driving conditions cannot affect the battery. Features  ModelOPTIMA RedTop RT S 4.2 TechnologyAGM Spiralcell Nominal voltage (V)12 Capacity (Ah)50 Cold start current EN (A)815 Dimensions (L x W x H in mm)254 x 175 x 200 ConnectionSAE autopol & side terminals Weight (kg)approx. 17.6  FAQs about the OPTIMA RedTop BatteryWhat is the main advantage of SPIRALCELL TECHNOLOGY®?The spiral cell technology ensures an extremely robust and vibration-resistant internal structure, a very low internal resistance for maximum starting currents and a longer service life compared to traditional batteries with flat plates. It is optimised for maximum starting performance.What is the difference between OPTIMA RedTop, YellowTop and BlueTop?RedTop: A pure high-performance starter battery for maximum starting power. Ideal for vehicles where the starting process is the main load. YellowTop: A dual-purpose battery (starting and supply) for vehicles with high energy demands due to additional devices (e.g. winch, large hi-fi systems). BlueTop: Specialist for marine and leisure vehicles, available as a pure starter battery or as a dual-purpose battery.Is this battery suitable for vehicles with lots of electrical consumers?The RedTop is primarily a starter battery. If your vehicle also includes extensive equipment such as powerful hi-fi systems, additional headlights or a winch that are operated when stationary, an OPTIMA YellowTop or BlueTop (dual purpose) is a better choice, as these are designed for deep discharge cycles.Which charger do I need for this AGM battery?For AGM batteries, especially OPTIMA batteries, a modern, microprocessor-controlled charger is recommended that has a special charging curve for AGM batteries. This ensures full and gentle charging and maximises service life.How should this lead-acid battery be disposed of?Lead-acid batteries contain environmentally harmful substances and must not be disposed of in household waste. You can return your old battery free of charge to any retailer that sells new batteries or to municipal recycling centres to ensure proper recycling.

The OPTIMA RedTop RT S 3.7 is a revolutionary high-performance starter battery that delivers maximum starting power in a compact and extremely robust housing thanks to the patented SPIRALCELL TECHNOLOGY®. With a nominal voltage of 12 V and an enormous cold start current of 730 A, it is the ultimate solution for demanding vehicles that require a reliable and powerful start under all conditions. Its extreme vibration resistance and the absolutely maintenance-free, leak-proof design make it the first choice for hot rods, off-road vehicles, agricultural machinery and all vehicles that need more than just an ordinary battery.Highlights at a glanceMaximum starting power: Offers the highest possible starting performance for reliable engine start even at extreme temperatures.SPIRALCELL TECHNOLOGY®: Unique spiral cell design for extreme vibration resistance and longer service life.Extreme vibration resistance: Up to 15 times more vibration-resistant than conventional batteries, ideal for tough off-road use or heavy vibration.Absolutely maintenance-free and leak-proof: The sealed AGM design enables installation in virtually any position.Long service life: Lasts up to three times longer than a conventional starter battery.Maximum performance for demanding vehiclesThe OPTIMA RedTop RT S 3.7 was specially developed for the extreme demands of high-performance vehicles whose main requirement is a powerful starting impulse. It is the ideal choice for trucks, SUVs, hot rods, classic cars and construction vehicles. It reliably supplies the necessary energy to start large engines effortlessly, even during seasonal use or after long periods of inactivity. Its compact design and high power density also make it the perfect solution for vehicles with limited installation space.Superior SPIRALCELL TECHNOLOGY®The heart of every OPTIMA battery is the unique SPIRALCELL TECHNOLOGY®. Instead of flat lead plates, highly pure lead spirals are used here, which are wrapped with a glass fibre mat (AGM). This compact and extremely stable design minimises plate spacing, maximises active surface area and reduces internal resistance. The result is unmatched starting performance that can be delivered consistently even under the harshest conditions.Built for the most demanding conditionsThe OPTIMA RedTop is designed for tough use. Its sealed construction not only prevents acid leakage, but also evaporation, making it absolutely maintenance-free. The robust construction made of shock-resistant polypropylene and the extreme vibration resistance ensure that vibrations and jolts during demanding driving operation cannot harm the battery. Features  ModelOPTIMA RedTop RT S 3.7 TechnologyAGM Spiralcell Nominal voltage (V)12 Capacity (Ah)44 Cold start current EN (A)730 Dimensions (L x W x H in mm)245 x 172 x 194 ConnectionSAE auto post & side connections Weight (kg)approx. 14.7  FAQs about the OPTIMA RedTop batteryWhat is the main advantage of SPIRALCELL TECHNOLOGY®?The spiral cell technology provides an extremely robust and vibration-resistant internal structure, a very low internal resistance for highest starting currents and a longer service life compared to conventional batteries with flat plates. It is optimised for maximum starting performance.What is the difference between OPTIMA RedTop, YellowTop and BlueTop?RedTop: A pure high-performance starter battery for maximum starting power. Ideal for vehicles where the starting process is the main load. YellowTop: A dual-purpose battery (starting and supply) for vehicles with high energy demand due to additional consumers (e.g. winch, large hi-fi systems). BlueTop: Specialist for marine and leisure vehicles, available as a pure starter battery or as a dual-purpose battery.Is this battery suitable for vehicles with many electrical consumers?The RedTop is primarily a starter battery. If your vehicle, in addition to starting, also has extensive equipment such as powerful hi-fi systems, auxiliary headlights or a winch operated when stationary, an OPTIMA YellowTop or BlueTop (dual purpose) is the better choice, as these are designed for deep discharge cycles.Which charger do I need for this AGM battery?For AGM batteries, especially for OPTIMA batteries, a modern, microprocessor-controlled charger is recommended, which has a special charging characteristic for AGM batteries. This ensures full and gentle charging and maximises service life.How should this lead battery be disposed of?Lead batteries contain environmentally harmful substances and must not be disposed of in household waste. You can return your old battery free of charge to any dealer who sells new batteries or to municipal recycling centres to ensure proper disposal.