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Your comes completely assembled. Disassembly only will be required when changing batteries or the bulb.

It is for use only by factory-certified technicians performing authorized warranty service on the Mag-Lite® and/or other Mag-Lite® System™ components.

https://en.wikipedia.org/wiki/Rechargeable_battery

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https://en.wikipedia.org/wiki/Rechargeable_calling_card

https://en.wikipedia.org/wiki/Rechargeable_electric_vehicle

https://en.wikipedia.org/wiki/Rechargeable_Lithium_Air_Battery

Rechargeable Batteries | eBay