It’s that time of year, I’m breaking out the lights for a spot of night riding.

Unfortunately it seems the batteries have about had it. They came from C&B Seen, just bog standard 4×18650 style pack and although the charger claims to have charged them, they seem to last around 30 seconds before cutting out.

I recall leaving them at about half charge before I put them away last spring, but not used them since. They’re a couple of years old, but not had the kind of use which would render them useless just yet.

Any top tips for reviving them?