Yuasa Motorbike battery YTX20L-BS / YTX20L 12V 18Ah (18.9Ah) (AGM maintenance-free)
Product information
The Yuasa YTX20L-BS (or YTX20L as factory-filled variant) is a robust standard AGM battery for heavy motorbikes, ATVs and water sports equipment. With a capacity of 18 Ah (10h) or 18.9 Ah (20h) and a cold cranking current of 270 A (EN), it provides a solid and reliable power supply for vehicles that need a lot of starting power, but do not necessarily require the high-performance peaks of the more expensive “H” series. The “L” denotes the special pole arrangement with the positive terminal on the right side.
Highlights at a glance
- Proven standard: The reliable basic version for large displacements. Ideal for vehicles where durability and value for money are paramount.
- Special polarity (type L): The “L” stands for the pole arrangement positive terminal right. This is the standard for many American motorbikes (Harley-Davidson) as well as numerous jet skis and quads.
- AGM technology: Because the electrolyte is bound in glass fibre, the battery is leak-proof (up to 45° tilt) and highly resistant to vibrations – perfect for tough use on water or off-road.
- Maintenance-free: Thanks to VRLA technology (valve regulated), the system is hermetically sealed after the initial filling; topping up with water is not necessary.
- High capacity: With almost 19 Ah, it offers enough buffer for on-board electronics and accessories, even when the engine is not running.
- Versatile use: A genuine all-rounder, just as at home in cruiser motorbikes as in snowmobiles and jet skis (PWC).
The standard for Harley, Goldwing & Jet-Ski
The YTX20L-BS is the standard replacement battery for a wide range of Harley-Davidson models (Sportster, Dyna, Softail – note the year of manufacture!), older Honda Goldwing models (GL 1800), Triumph Rocket III and many Yamaha and Sea-Doo jet skis. It reliably provides the necessary voltage to safely start these vehicles.
Characteristics
| Model | Yuasa YTX20L-BS (Standard MF) |
| Application | Motorbike, ATV & Jet Ski / PWC (Standard Performance) |
| Technology | AGM (VRLA) - Dry pre-charged (incl. acid pack) |
| Voltage | 12 V |
| Capacity | 18 Ah (10 hrs) / 18.9 Ah (20 hrs) |
| Cold cranking current (CCA) | 270 A (EN) |
| Dimensions (L x W x H in mm) | 175 x 87 x 155 |
| Pole arrangement | 0 (positive terminal right - CAUTION!) |
| Terminal type | Type 4 (front/top mounting) |
| Base plate | N (No base plate) |
| Features | Tilt-proof up to 45° (after filling), standard for many PWC |
| Weight (kg) | approx. 6.3 (filled) |
FAQs about the Yuasa YTX20L-BS
What is the difference from the YTX20HL-BS?
The difference is the starting power (“Cold Cranking Amps”).
- YTX20L-BS (your battery): Standard model with 270 A.
- YTX20HL-BS (High Performance): Reinforced model with 310 A. The standard version is cheaper and is perfectly adequate for normal use and moderate climates. If you ride in extreme sub-zero temperatures or have a high-compression tuning engine, you should opt for the HL version.
What is the difference from the YTX20-BS (without L)?
The difference is the polarity.
- YTX20-BS: Positive terminal is left.
- YTX20L-BS (your battery): Positive terminal is right. Since battery cables on motorbikes are usually very short and rigid, the wrong battery often cannot be connected. Check the position of the terminals on your old battery before buying.
Does this battery fit in a jet ski?
Yes, the YTX20L-BS is one of the most frequently used batteries for jet skis (PWC) from Sea-Doo, Yamaha, Kawasaki and Polaris. Thanks to AGM technology, it is leak-proof and can withstand “bouncing” on the waves. Good maintenance is particularly important in winter (removal and charging), as jet skis often have long periods of inactivity.
| Capacity: | 18.9Ah |
|---|---|
| Tension: | 12V |
Login
Customers also bought
The Saft LS14500 is a high-performance lithium thionyl chloride battery (Li-SOCl2) in the standard AA size, developed for demanding industrial applications with high energy demand. It offers a nominal voltage of 3.6 V and a superior capacity of 2.6 Ah. Thanks to its extremely low self-discharge and robust design, it is the ideal choice for long-life applications that demand maximum reliability and long operating life.Highlights at a GlanceHigh capacity: 2.6 Ah in standard AA size for maximum energy densityPowerful: High and stable operating voltage of 3.6 VExtremely long-lasting: Very low self-discharge of less than 1 % per yearReliable: Excellent response behaviour even after long storageRobust: Hermetically sealed stainless steel case for maximum operational safetyVersatile: Usable in a wide temperature range from -60 °C to +85 °CPowerful for Versatile Industrial ApplicationsThe Saft LS14500 in AA format is the perfect energy solution for a wide variety of professional and industrial devices. Its high energy density makes it the first choice for wireless alarm systems, memory backup systems (memory back up), gas, water or electricity meters (metering), professional electronics as well as tracking systems. Thanks to its ability to deliver stable performance even at low temperatures, it ensures the functionality of your devices under all conditions.Efficiency and Guaranteed SafetyThe proven lithium thionyl chloride technology guarantees reliable energy output over many years. The cell is hermetically sealed with a glass to metal seal to minimise the risk of leakage, and features a non-flammable electrolyte, which significantly increases operational safety. The LS14500 is compliant with the IEC 60086-4 safety standard and is UL certified, underlining its suitability for safety-critical applications.Robust Li-SOCl2 Technology for IndustryLithium thionyl chloride chemistry stands for superior energy density and exceptionally long service life. Compared to other battery technologies, it offers a stable voltage down to the end of the discharge cycle, even after long storage periods. The robust construction reliably protects the cell against corrosion and environmental influences, thus ensuring the functionality of your application throughout the entire product lifetime. Features ModelSaft LS14500 TechnologyLithium-thionyl chloride (Li-SOCl₂) SizeAA (Mignon) Nominal Voltage (V)3.6 Capacity (mAh)2600 Max. Continuous Discharge Current50 mA Self-dischargeapprox. 1% per year Operating Temperature (°C)-60 ~ +85 Dimensions (Ø x L, mm)approx. 14.5 x 50.3 Weight (g)approx. 16.5 ConnectionStandard (industrial head) RechargeableNo FAQs on the Saft LS14500 Lithium Cylindrical CellCan I replace a standard 1.5 V AA battery with a Saft LS14500?No, definitely not. The Saft LS14500 has a voltage of 3.6 V, which is more than double that of an ordinary alkaline or lithium AA battery (1.5 V). Using it in a device designed for 1.5 V batteries would immediately and irreparably damage the electronics.Is the Saft LS14500 rechargeable?No, the LS14500 is a lithium primary battery and must not under any circumstances be recharged. Any attempt to do so is dangerous and can lead to destruction of the cell, leakage or explosion.For which applications is the LS14500 particularly well suited?It is ideal for professional applications with low continuous current, which must function reliably for many years. These include, in particular, battery-operated sensors, meters (electricity, gas, water), security technology, memory buffering (memory back up) and GPS trackers.What is the difference to the Saft LS14250?The principal difference is in the size and capacity. The LS14500 is AA size and offers a capacity of 2.6 Ah. The LS14250, on the other hand, is half size (1/2 AA) and consequently has a lower capacity of 1.2 Ah. The choice depends on the energy requirement and available space in the application.How should the LS14500 be correctly disposed of?As a lithium battery it is subject to special disposal regulations. It must be given to appropriate municipal collection points or specialist retailers. Disposal with household waste is not permitted.