[funkymonkey]

Not sure if a resistor would work cos it also has a habit of dropping the voltage too, but you are right in saying that if for example you had a 100ma charger and connected it to four (flat) batteries they should consume 25ma each.

Someone posted a link somewhere on here to a Vellerman kit (the type you just solder together onto a ready made PCB with instructions) for a charging circuit that depending on where you put some jumpers will charge from 1.5-9V at anywhere from 15 to 750ma (if I recall correctly). That looked pretty handy.

In fact if you wanted to make a complete charging station, it probably wouldn't be a big job to modify that board slightly so that you could cram it in a hobby box and use a couple of dials for voltage and current, and have a charging pad coming out of the top. Voilla - you could charge anything from stock to multi-cell jobs at the flick of a switch.