What is the battery capacity and expected lifespan of the FC2's battery?

The FC2 uses a Li-ion battery with a capacity of 6500mAh. The lifespan of a lithium-ion battery is generally two to three years, with a cycle charge of 300 to 500 times. A full charge cycle means a full charge, a full discharge, and a full charge. (Pages 6, 20)

From the official Efix Fc2 Handheld Controller manual, page 6

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