Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
These batteries are "AA" size, but have 3.7v instead of 1.5v. When coupled with a flashlight made to accept either AA or 14500, you typically get brighter light, longer runtime, or both. I used one of these with Ultrafire sku.19187 , and it is noticeably brighter.
Being that they are the same size as AA, they could be confused with AA and you could fry something not made for the extra voltage. If you have kids, don't put it with your regular batteries.
I charge these in the same Ultrafire charger I charge my 18650's in, which is handy. No spacers or other charger needed.
If you have an application for them, they are just the thing.
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