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What kind of battery do you have?
18650 and 21700 rechargeable Li-ion battery.
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What is the battery life?
About 500 times charge and discharge cycles.
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What is the meaning of “18650”?
18 means the diameter of the battery, and 65 means the length of the battery, 0 means the cylindrical shape.
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What should I do if the battery reaches its service life?
Just buy the same type battery as before is right.