Involvement:Novice (still getting used to it) - Ownership:less than 1 day
This is a nice way to upgrade a flashlight if it's capable of the extra voltage.
The longer length doesn't fit very well in my flashlight (zebra). When I first put this battery in my light (after charging it) and hit the button - nothing happened. It was tough to screw the cap on all the way. After playing with it a little though it started working and is a good improvement over 1.5v batteries. This is not a technical rating but I would say the light is around 30-40% brighter. A very visible improvement.
If I continue to have problems I might try to buy a shorter 3.7v battery. But for now it seems fine.
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