Yuasa SWL+1200FR Industrial VRLA battery - 12V / 40.6Ah (Flame Retardant)

The Yuasa SWL+1200FR is the safety-optimised version of the proven SWL+ high-performance battery. The abbreviation "FR" stands for Flame Retardant (flame retardant). This 12V block not only offers the extremely high energy density and longevity of the SWL+ series (40.6 Ah), but also has a housing of the highest fire protection class (UL94 V-0).

This makes this battery the mandatory choice for installations in areas with increased safety requirements, such as public buildings, airports, hospitals or data centres, where fire safety regulations must be strictly adhered to. It combines maximum reliability (Very Long Life) with maximum building protection.

Highlights at a glance

• FR safety housing (Flame Retardant): The housing and cover are made of flame-retardant ABS plastic in accordance with the standard UL94 V-0. In the event of fire, the material extinguishes itself and prevents the spread of fire.
• Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This minimises replacement cycles and lowers the total cost of ownership (TCO).
• Maximum power density (SWL+ technology): Delivers up to 40% more discharge power than standard batteries (NPL series) of the same size. Ideal for the high short-duration currents of modern UPS systems.
• Maintenance-free VRLA-AGM technology: Thanks to recombination technology, no topping up with water is necessary. The electrolyte is bound in the fibreglass fleece (AGM), which makes the battery leak-proof.
• Hybrid grid plates: The special grid alloy of the SWL+ series drastically reduces corrosion and self-discharge, which increases storage life and durability.
• Compact dimensions: Despite 40.6 Ah capacity, it fits into the standard slots (approx. 197 x 165 mm) and replaces less powerful batteries (e.g. 38 Ah) 1:1.

Fire protection & safety (FR specification)

The crucial difference to the standard SWL+1200 is the housing material.

• Standard (HB): Burns slowly, but keeps burning.
• FR (V-0): Must extinguish within 10 seconds in the vertical burn test; no burning dripping permitted. In many tenders for data centres, telecommunications equipment and emergency lighting systems in escape routes, the use of batteries with UL94 V-0 housing is now mandatory to ensure insurance cover and operating authorisation.

Areas of application

The SWL+1200FR is designed for critical infrastructures:

• UPS systems (UPS): Especially in server rooms and data centres with high fire load density.
• Safety lighting: Central battery systems according to EN 50171.
• Telecommunication: Switching centres and masts.
• Energy provider: Switchgear and controls.
• Starting applications: Emergency diesel generators in buildings.

Technology & structure

The SWL+1200FR uses the most advanced lead-acid technology:

1. VRLA (valve regulated): Each cell has a low-pressure safety valve that releases excess gas during significant overcharge. Under normal operation, over 99% of the gases recombine to water.
2. AGM separators: The microporous glass fleece binds the acid and ensures minimum internal resistance – key for extremely high discharge currents (High Rate Performance).
3. Electrode structure: Optimised plate design for rapid energy release and fast recharging after a mains failure.

Assembly & operating instructions

• Charging voltage (float charge): 2.275 V/cell ±1% (corresponds to 13.65 V per block at 20°C).
• Temperature compensation: If temperatures are permanently above 20°C, the charging voltage should be reduced (-3mV/cell/°C) to avoid drastically shortening the service life.
• Tightening torque: The M5 screws should be tightened to 2.5 Nm.
• Installation position: Can be installed horizontally or vertically (not permanently upside down).

Features

FAQs about the Yuasa SWL+1200FR

Can I mix "FR" batteries with normal batteries?

Technically yes, safety-wise no. Electrically, the SWL+1200 and SWL+1200FR are identical. However, if you replace a single block in a string consisting of FR batteries with a standard battery, you lose the fire protection certification of the system for the entire string ("chain"). In addition, batteries should always be replaced as a batch (same age).

How can I recognise the FR version visually?

Yuasa usually marks the FR versions with a grey cover/housing (as opposed to the often black standard housing) or by a distinct imprint "FR" or "UL94 V-0" on the type plate.

Is the SWL+1200FR more expensive than the standard version?

Yes, slightly. The special plastic granulate for the UL94 V-0 housing is more expensive to manufacture. However, the extra cost is negligible compared to the damage that a battery fire could cause in a data centre.