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Best : SureFire SideKick.

It has a spring loaded clip so it hangs on your just like a traditional , but the blade of the KeyMate is the . It has a multi-function push button switch which shows the charge status of the 110mAh lithium polymer battery that is with the included USB cable.

Bright 45 Lumens Nitecore Tube . Built-in battery and USB charger. Single click for low and double click for high, and 1-45 Lumens variable brightness. Also include a 25 Lumens Lumen Tactical .

Mini LED – Small USB 130lumen Waterproof Bright LED with 2 Modes Including Battery, Micro USB Cable, Waterproof O-rings and O-Ring (Black).

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

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

Rechargeable Batteries – Energizer

http://www.epa.gov/osw/conserve/materials/battery.htm

Rechargeable battery – Wikipedia

Rechargeable Battery Recycling – NYS Dept. of …