Yuasa REW45/12 12 V 45 W high-load battery 8 Ah

The Yuasa REW45/12 is a maintenance-free VRLA high-performance battery with 12 volts, 45 W 10-minute power rating and 8 Ah (C20). Thanks to its optimised high-current discharge and compact design, it is ideal for UPS systems, safety and emergency lighting, fire alarm and burglar alarm systems as well as measurement and control technology.

Highlights at a glance

• High load performance: 252 W per block at 10 minutes up to 9.6 V block voltage, alternatively 42 W per cell up to 1.6 V/cell at 20 °C.
• Reliable capacity: 8 Ah with 20-hour discharge up to 1.75 V/cell, 6.96 Ah with 10-hour discharge up to 1.8 V/cell.
• Compact and lightweight: 151 x 64 x 94 mm, height above connector 97.5 mm, only 2.7 kg.
• Easy installation: FASTON plug connections 6.35 mm.
• Service life class: EUROBAT General Purpose 6 to 9 years, Yuasa service life up to 10 years at 20 °C.

Maximum performance for demanding applications

The REW45/12 is designed for high discharge rates. With an internal impedance of just 24 mΩ, it reliably provides high power for short periods and protects connected systems from voltage drops. Typical areas of application are UPS systems with short backup times, alarm and security technology, as well as buffer applications with dynamic load profiles.

Efficiency meets long service life

A float charge voltage of 13.65 V ±1 percent per block (2.275 V/cell) at 20 °C applies for standby operation. Temperature compensation is minus 3 mV per cell and degree Celsius. For cyclic or rapid charge, 14.50 V ±3 percent per block (2.42 V/cell) is specified, with compensation of minus 4 mV per cell and degree Celsius. No current limitation is required for float charging, for rapid charging 2 A is recommended.

Technology for flexible applications

The permissible temperature range for storage, charging and discharging is between minus 15 °C and plus 45 °C. The robust ABS housing according to UL94 HB increases operational safety. Each cell has a low-pressure relief valve for safe pressure regulation. Please ensure sufficient ventilation, as VRLA batteries can release hydrogen.

FAQs about the Yuasa REW45/12 battery

What is the expected service life?

The EUROBAT classification General Purpose specifies 6 to 9 years. For standby operation at 20 °C, Yuasa indicates a service life of up to 10 years.

What is the REW45/12 particularly suitable for?

For applications requiring high short-term performance such as UPS systems with short autonomy, emergency and safety lighting, alarm and signalling systems, as well as measurement and control technology.

Which charging voltages are recommended?

Float charge 13.65 V ±1 percent per block at 20 °C with temperature compensation of minus 3 mV per cell and degree Celsius. Cyclic or rapid charge 14.50 V ±3 percent per block with compensation of minus 4 mV per cell and degree Celsius. No current limitation is necessary for float charging, for rapid charging 2 A.

May the REW45-12 be used in a closed housing?

No, VRLA batteries can release hydrogen gas. Therefore, operation in tightly sealed housings is not permitted, and sufficient ventilation must be provided.

Is the battery maintenance-free?

Yes, the Yuasa REW45/12 is a valve-regulated AGM design with almost complete gas recombination; each cell has a low-pressure relief valve.

Can the REW45-12 be used as a replacement for common 12 V-7 Ah blocks?

Often yes, provided that there is sufficient space, 6.35 mm plug connections, appropriate charging parameters and the required high current rating for the application.