Yuasa SWL4250FR VRLA high performance battery

The Yuasa SWL4250FR is a VRLA high-performance battery with 12 volts, 150 Ah (C20) and 4266 W 10-minute power rating per block. It combines very high short-term performance with a long service life and flame-retardant housing for maximum operational safety in professional applications.

Highlights at a glance

• Very high performance: 4266 W per block at 10 minutes up to 9.6 V block voltage, alternatively 711 W per cell up to 1.6 V per cell at 20 °C.
• High capacity: 150 Ah with 20-hour discharge up to 10.5 V, 140 Ah with 10-hour discharge up to 10.8 V.
• Long service life: EUROBAT Long Life 10 to 12 years, Yuasa service life up to 10 years at 20 °C.
• Safe and robust: ABS housing UL94 V0, low pressure relief valves.
• Flexible installation: Operation in any position, except permanently upside down.
• Easy installation: M8 female thread or stud connection, tightening torque 6 Nm.

Maximum performance for demanding applications

The SWL4250FR delivers reliable peak performance thanks to very low impedance and high short-term current capability. This makes it ideal for UPS systems with high power density, emergency and safety power supplies, data centres, telecommunications, industrial controls and buffer storage in critical infrastructures.

Efficiency meets long service life

For standby operation, a float charge voltage of 13.65 V ±1 percent per block (2.275 V per cell) at 20 °C applies. Temperature compensation is minus 3 mV per cell and degree Celsius. For boost charging, 14.50 V ±3 percent per block (2.42 V per cell) is specified, with compensation of minus 4 mV per cell and degree Celsius. 

No current limitation is required for float charging, 35 A is recommended for boost charging. The low self-discharge of about 3 percent per month supports long service life.

Technology for flexible applications

The wide temperature range enables versatile applications: Discharge from minus 20 °C to plus 60 °C, charge from minus 15 °C to plus 50 °C, storage from minus 20 °C to plus 50 °C. The battery must not be operated in gas-tight housings. Each cell is equipped with a low-pressure relief valve for safe pressure regulation.

Characteristics

FAQs about the Yuasa SWL4250FR battery

What is the SWL4250FR designed for?

For UPS and other applications with high short-term performance requirements. The SWL series is a high-rate VRLA range with EUROBAT Long Life 10 to 12 years.

How does SWL differ from NPL?

The SWL series is an optimised further development of the NPL series with improved energy-to-density ratio and up to 40 percent additional discharge capacity under high-current discharge.

What are the temperature ranges for storage, charging and discharging?

Storage fully charged minus 20 to plus 50 °C, charging minus 15 to plus 50 °C, discharging minus 20 to plus 60 °C. 

Can the battery be operated in a closed housing?

No, VRLA batteries emit hydrogen gas. Therefore, they should not be operated in airtight enclosures and sufficient ventilation must be ensured.

How is the battery installed?

Installation is possible in any position except permanently upside down. Connection is via M8 female thread or stud terminals. Please observe a tightening torque of 6 Nm, correct polarity and sufficient ventilation.

Is the housing flame-retardant?

Yes, the housing is made of ABS and meets the UL94 V0 classification.