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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.
I have a light like this that I bought from Ebay:
https://www.amazon.co.uk/HLLP-Powerful-Rainproof-Headlight-Rechargeable/dp/B076V66JSV/ref=zg_bs_550001011_39?_encoding=UTF8&psc=1&refRID=HS2XN845AN4ECPM3M1D3
and the light is ace, but the battery only lasts an hour, even on low setting. can someone point me towards a reputable battery pack that will work with this, and last a good few hours for night rides?