[JeniSkunk (Jenifur)]

Originally Posted by AstroApprentice

I find one of these very useful:
TradeToolSupplies Powertech MB-3748 Portable Power Centre Multi-function 42Ah AC/DC/USB Outputs
Also available at Jaycar for a bit more.

Originally Posted by Ukastronomer

Surely just a VERY expensive packaged low power car battery ?
garages will happily GIVE you a used 70+ amp hour battery free if you ask.

Jeremy, the Powertech power centre is built around lithium ion batteries. The sort of batteries in an electric, or hybrid car.
Not the batteries you were thinking of, found in a classic petrol or diesel car.