Battery Safety Guide

Thermal events, swelling, ventilation and what to do when a pack fails.

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Thermal events, swelling, ventilation and what to do when a pack fails.

Thermal runaway and fire risk

Lithium fires are a heat problem: cool the pack, isolate it, and let it burn out if it is already venting.

Ventilation, handling and personal safety

Lithium removes the acid hazard and adds an electrical one — insulated tools matter more than gloves.

Maintenance & safety questions

The questions that come before an order.

How long should a lithium battery last?

A good LiFePO4 pack gives 4,000–6,000 cycles at 80% depth of discharge, which is eight to ten years of daily use. Heat, sitting at 100% and charging below freezing are what shorten it.

How do I test a battery?

Measure resting voltage first, then voltage under a known load, then internal resistance if you have the tool. A pack that holds voltage at rest but collapses under load has a bad cell group or a weak connection.

What maintenance does a lithium battery need?

Very little: keep terminals clean and tight, keep the enclosure ventilated, and review the BMS log periodically. There is no watering, no equalising and no acid to check.

Is a swollen battery dangerous?

Yes — stop using it and stop charging it. Swelling means gas inside the cell, and the pack should be replaced rather than investigated.

How should batteries be stored?

At around 50% state of charge, in a cool, dry place, disconnected from loads. Leaving a pack flat for months is what does the damage.

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