How to store your headtorch batteries…

Lithium batteries power most modern head torches, but they can quietly discharge even when the light is switched off. If you’re not planning to use your torch for a few weeks or months, it’s worth removing the battery. It’s a small habit that can save money, extend battery life, and reduce unnecessary waste.

Many modern head torches include small electronic components that can continue to draw a tiny amount of current even when the torch is off. This “parasitic drain” is usually very small, but over long periods it can slowly deplete the battery.

The problem arises when a lithium battery is allowed to discharge too deeply. Most lithium-ion cells have built-in protection circuits designed to prevent this, but if the voltage drops below a certain threshold the battery may become permanently damaged. In some cases the protection circuit will simply refuse to allow the battery to charge again. What looks like a healthy battery can suddenly appear “dead,” even though it was barely used.

The result of this is having to buy a replacement battery, which costs money and adds to landfill.

The solution is simple: if your head torch is going into a tackle bag or drawer for a while, remove the battery or store it separately. Ideally store lithium cells partially charged (around 40–60%) in a cool, dry place.

For cavers who rely (and spend a lot of money) on their lights, this small step helps ensure your battery is ready when you need it, and helps prevent perfectly good batteries from ending up in the bin.