I bought a 12v supper ( <-- that's how its written on eBay) rechargeable li-ion 6800mah battery. It has a switch, LED built in, 2x 2.5mm DC jacks (1x male 1x female) and comes with a 500mah AC charger. The size is utterly amazing! Its small and light, I highly doubt it can be 6800mah, but I have used it for powering my 7"LCD and av receiver. The battery has been fine up until last weekend when it either went flat or something in my wiring went astray (likely the latter). Not that I think of it, I have used it quite a but since I first got it and charged it too. Anyways . .
eBay item #360584450180. <--- under $25!
There is also 9000+MaH ones!
Now, Rotor Head, while I'm here, I've been meaning to ask about the username? Can I assume your a fan of a particular Mazda Engine??