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How simple? 4 x 1.2v = 4.8v
Get an adjustable regulator, set 4.8v and stick a resistor on it to trickle charge..
I've never been too sure about charging cells in series, but i think nimh cells don't mind too much
Thanks guys , very helpful I now have all the info I need to crack on .All that is needed is a voltage source significantly higher than the batteries full charge voltage and a resistor. The resistor should be calculated to drop (Vin - Vbatt) at a current of C / 20.
This will cause a higher charging current when the battery is depleted, which is okay, going down to the C/20 current when the battery is fully charged.
Bob