ARWadsworth wrote:

It is about the wall mart type chargers. One came with the digital camera,
another with the sat nav another with the video camera etc.

I just want to laeve the latst one plugged into the wall socket and change
USB leads as and when needed.

Yeah, just pick the beefiest out of the lot (e.g. newer phones can suck
up to 1000mA from a suitable charger, using "signalling" resistors
between the pins to indicate htis) and you should be fine, saves keeping
a whole row of wall warts warm.