A very nice gadget indeed, this one. They work perfectly and sometimes charge quicker than advertised. They are, though, only 1300mAh, which means they don't last long in high drain devices such as digital cameras and CD/Mp3 players, which is a shame. But, for wireless mice and keyboards, they are fantastic. You can't loose the lids, thanks to cords attaching them to the battery. One of my friends thought they stored information as well - so I will make this clear- they are batteries, not USB sticks with a built in battery. They do exactly what they say on the tin.
They can get hot after a lot of recharging, though. But I'm told you can recharge them in a normal battery AA recharger, too. The best thing is that you don't need a charger, which makes these somewhat cheap. And they look quite cool, too.
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