Yuasa SWL+4300 Industrial VRLA battery - 12V / 140Ah (Max Performance)

The Yuasa SWL+4300 marks the absolute peak of performance in the field of industrial 12V monoblocks. With a capacity of 140Ah (often rated up to 150Ah at C20) and an enormous power density, it is the most powerful model of the SWL-Plus series.

This battery is designed for applications where maximum energy density is required in a limited space. It not only delivers extremely high discharge currents (high rate), but also offers maximum autonomy times. With its Eurobat "Very Long Life" classification, the SWL+4300 is the premium solution for megawatt UPS systems and critical power grids that need to run reliably for over a decade.

Highlights at a glance

• Peak Performance (4300 Watt): The figure "4300" refers to the maximum power output (watts per block). This is one of the highest values technically achievable in a 12V AGM housing. It handles even the most aggressive load jumps of modern cloud servers.
• Maximum Capacity (140Ah+): While many batteries of this form factor end at 120-135Ah, the SWL+4300 delivers a true 140Ah (or up to 150Ah at C20). This means maximum backup time without increasing the footprint.
• Eurobat "Very Long Life": Classified for a service life of 12+ years (Design Life 15 years). This significantly reduces the replacement effort and associated logistics costs (an important factor at this weight).
• HT Element X Technology: The advanced hybrid alloy of the grids minimises internal corrosion and prevents premature ageing due to drying out or thermal stress.
• Maintenance-free & Robust: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound, and the housing is reinforced to safely hold the heavy weight of the massive lead plates.
• High cycle resistance in standby: Even with frequent short discharges or unstable grids, the SWL+4300 is considerably more robust than standard UPS batteries.

Areas of application

The SWL+4300 is the first choice for "mission critical" applications:

• Hyperscale Data Centre: Where every square metre of floor space is extremely expensive and maximum kW output is required.
• Large UPS Systems: In banks, hospitals and industrial operations.
• Telecommunication: Central network nodes with high power demands.
• Utility Providers: Peak load coverage and switchgear control.
• Emergency power systems: Starter battery for large diesel engines (gensets) or turbines.

Installation & Safety Instructions

• Warning: High weight: A single block weighs around 50 kg. This is well above manual handling limits. Always use lifting equipment or work in a team. Check the floor load (kg/m²) in the server room!
• Connection (M8): Due to the extreme currents (short-circuit current >3000A), M8 bolts are installed. These must be tightened to 6 Nm. Use insulated tools to avoid life-threatening electric arcs.
• Wiring: Use connectors with a sufficient cross-section (at least 70mm² or copper rails) for lossless transfer of the 4300-watt output.
• Cooling: Densely packed high-performance batteries generate heat. Ensure spacing between the blocks (approx. 10mm) for air circulation.

Features

FAQs about the Yuasa SWL+4300

What is the difference to the SWL4000?

The SWL+4300 is the high-end advancement. With identical or very similar dimensions, denser plate packing and optimised grids increase power from 4000 to 4300 watts. It maximises the physical potential of the housing volume.

Can this battery still be installed by hand?

Only to a limited extent. Sliding 50 kg onto a lower shelf is possible but not ergonomic. On upper levels of a battery cabinet, this block should only be lifted with a battery lift. Health and safety regulations often prohibit manual lifting of such loads.

Is the SWL+4300 compatible with older SWL3800?

Mechanically yes, electrically no. It fits the same space (footprint), but has significantly more capacity and performance. Never mix SWL3800 and SWL+4300 in one string. If replacing the entire system, the SWL+4300 is an excellent upgrade for longer runtime.