This is a genuine Magicshine MJ-808, ordered 2010, very bright, but battery pack is not working, at zero volts think the battery management circuit kicked in. I haven't physically investigated this at all but chatgpt says they are probably two cells in parallel x 2, so 8.4v across the pack, probably 18650s. You can recover batteries that have gone like this by bypassing the battery management circuit and charging directly, but you need to open the pack up to do that, and then you want some heat shrink sleeving to put it back together.
I have the pouch for the battery as well (not pictured). I'm pretty sure the LED unit itself works but can't test it right now.
Bike light and battery (non-working battery) (Kennington OX1)
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