BG413518523
BG413518523 Any 20350 will do. It's all Li-ion 3.7v so as long as they say it's in the 1200-1400 mAh range then they are not lying. Hell if you could rig a 10440 AAA size 350 mA in there it would work. It's all the same voltage. With this flashlight you could even use a 18350 in there however it may rattle a bit. The 20350's are a bit thicker and have a little more capacity.
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BG413518523 It'sa 20350. It's a new size of battery, just google it and order them. I did. You could use a 18350 no problem though but it has lower capacity and may rattle a bit.