Yuasa SWL1800 VRLA high-performance battery

The Yuasa SWL1800 is a VRLA high-performance battery with 12 volts, 57.6 Ah (C20) and 1974 W 10-minute power rating per block. It combines high short-term performance with a long service life and optional flame-retardant housing. Ideal for UPS systems, emergency and safety power supplies, data centres, telecommunications, and industrial control systems.

Highlights at a glance

• High performance: 1974 W per block at 10 minutes up to 9.6 V block voltage, alternatively 329 W per cell up to 1.6 V per cell at 20°C.
• Strong current output: up to 800 A for 1 second, 500 A for 1 minute.
• Long service life: EUROBAT Long Life 10 to 12 years, Yuasa service life up to 10 years at 20°C.
• Easy installation: M6 internal thread or bolt connection, recommended tightening torque 4.8 Nm.
• Low self-discharge: about 3 percent per month at 20°C.

Top performance for demanding applications

With its very low impedance and high short-term current capabilities, the SWL1800 is ideal for uninterruptible power supply systems with high power density, safety power supplies, communication nodes, industrial buffering, and critical infrastructures, as it reliably delivers peak performance and stable voltage.

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 is recommended, supplemented by temperature compensation of minus 3 mV per cell and degree Celsius. No current limitation is necessary in this charging mode.

For high-rate charging, 14.50 V ±3 percent per block (2.42 V per cell) is recommended, with a compensation of minus 4 mV per cell and degree Celsius. A current limitation of 13.75 A is recommended here.

Technology for flexible applications

The wide temperature range allows versatile use: Discharge from -20°C to +60°C, charge from -15°C to +50°C and storage from -20°C to +50°C. The robust housing is made of ABS to UL94 HB as standard; an FR version to UL94 V0 is also available. Each cell is equipped with a low pressure valve for safe pressure regulation. VRLA batteries must not be operated in gas-tight housings, as hydrogen may be generated.

Features

FAQs about the Yuasa SWL1800 battery

What is the SWL1800 designed for?

For applications such as UPS that require high short-term performance, the SWL series is a VRLA range with high discharge capacity. This series is designed for a long service life of 10 to 12 years according to EUROBAT.

What is the capacity of the battery?

The nominal voltage is 12 V, with a capacity of 57.6 Ah at a 20-hour rate and 55 Ah at C10.

How much power does it deliver under high current discharge?

The typical 10-minute constant power is 1974 W per block up to 9.6 V at 20°C. Temperature ranges

What temperature ranges and self-discharge should be considered?

The recommended temperature ranges are:

• Storage (fully charged): -20°C to +50°C
• Charging: -15°C to +50°C
• Discharging: -20°C to +60°C

The typical self-discharge rate is about 3 percent per month at 20°C.

Can the SWL1800 be operated in a closed housing?

No, VRLA batteries emit hydrogen gas. Ensure sufficient ventilation and avoid operating in airtight enclosures.

What is the difference between SWL and NPL?

The SWL series is a further developed NPL design with improved energy-to-density ratio and up to 40 percent additional discharge capacity for high current discharge.