These batteries have been updated with the new 10 stage fuel gauge and new wire. All have been tested for capacity and have at least 90% of new. They should give you years of service.

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Gloworm's 6800mAh 4-cell battery pack is built of 4 Panasonic 18650 Li-ion cells enclosed in a hardshell case and includes a built-in 10 stage fuel gauge. 

8.2oz (232g), 3.0"x 1.75"x 1.75"

Works with all Gloworm lights and also all Magicshine and Gemini lights and many others. 

Works with all Gloworm, Gemini or Magicshine chargers.

Attaches to the bike with an included velcro strap.