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Will not work in a two battery flashlight, only in a single battery light, battery's positive pole is below flush, so that it will not make contact with the other battery
So far, great. I use these in my vape devices, they mostly tested with about a 3/4 charge. They all took a long time to fully charge, but it could be due to my chargers (they are old). I swap between two, 2 battery vape mods all day long. Today is the second day with the new batteries and they are still over 1/2 charged. So I'm assuming that in a single 2 battery mod/device, running at 50-60 watts, the batteries should last a full day. I just quit smoking(again), so I'm hitting the fire button from sun up way past down and then some(16-18 hours daily). So far I'm impressed with these. I've used ultrafires before and got +8 years out of a set of 10, that were sitting stored for 5 of those years. Actually a few of them are still functioning well. If these batteries last half that long I'll be ecstatic, money well spent and way cheaper than buying local. I purchased 8 of these, for under 20bucks including tax and shipping.(may have been free shipping?) If they last a year, I'm far ahead of the game.
Hands down the best style of this battery I found and the decent price as well in fast shipping. We use them primarily in vaping mods, and find they have great power, charge well, and all seem pretty equal. It's a solid deal.