AceBeam 10440 Li-Ion Battery
One of the smaller Li-ion batteries around, this is still a powerful, rechargeable unit that will keep your flashlights going for years. Charging it is best done in a separate unit from your flashlight, like a Nitecore F1 charger while on the go. It only takes one at a time, but the shorter size of the 10440 makes for shorter time in the F1.
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