Anything unexpected can go wrong. If you only have a single battery that fits and works in one specific light, something goes wrong with the battery.... Now you have an odd-looking paperweight. Always have at least two batteries for such lights, just in case.I thought that is the same technology and chemistry...
I have one that came with fenix uc02, how many charges i can get out of that battery?
Do i need more than that original battery in the first place?