Is the battery pack just multiple 18650 batteries (they do tend to be)? If so, replace them with some better ones, this is a reputable seller https://www.ebay.co.uk/sch/big_f_d_d/m.html?_nkw=&_armrs=1&_ipg=&_from=
Lots of the cheap knackered ones are taken from old laptop batteries.
ah maybe, I haven't taken it apart to look yet. Which number relates to battery capacity (as in amount of charge) when I'm looking?
The mAh figure is how long it will last for. The higher the better.
@n3il started
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Is the battery pack just multiple 18650 batteries (they do tend to be)? If so, replace them with some better ones, this is a reputable seller https://www.ebay.co.uk/sch/big_f_d_d/m.html?_nkw=&_armrs=1&_ipg=&_from=
Lots of the cheap knackered ones are taken from old laptop batteries.