Nitecore NL183 2300mAh 18650 Lithium Ion Battery
Integrated battery overcharge / discharge protection circuits
High discharge performance Li-ion rechargeable battery
More than 500 charge-discharge cycles
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I used a lot of batteries in my last headlamp. This rechargeable battery is nice because of saving plus I donot have to remove the battery. I just take the cover off and plug in the charger very simple.