USB rechargeable batteries
Most gadgets use wall sockets, batteries or USB sockets to power them up, right? Well, there are solar powered, shakable, some use dynamos that you have to turn, etc. Still, most electronic gadgets use those three.
Well, this is a USB gadget made for battery gadgets (actually, it would work perfectly fine with everything else too, but it’s more fun to have a gadget power a gadget, right?). These AA batteries have a USB plug concealed inside, that they use to charge themselves. You just plug them in and that’s it - and the LED indicator tells you the state of the charge. And there’s more - you can charge these in just about any battery charger.
These are NiHM rechargeable batteries, meaning they are 1.2V (non-rechargeable are 1.5V, and lithium batteries are 1.7V), so they may be weak for devices that require a lot of juice (Like lasers - nothing less than lithiums for them), but they will satisfy the needs for pretty much all usual electronics.
A pair of these batteries cost £12.95 (26$) at firebox. Being able to charge them from USB sockets could be handy, for example, charging them from a laptop while you’re on a trip, but consider that normal NiHMs at that capacity (1300mA) cost about 2 to 3 dollars a pair.