I've got a battery pack for one of my peripherals that recently died, so i took it apart to find half the (nicad) cells were dead (I tested each cell's voltage both with and without a load - the dead ones dropped off to zero with load).

So what i wish to do is replace them with nimh's. Apparently the easiest way to charge nimh's is at 10% of C (C being 2500mAh) for 15 hours at 1.5V per cell (i will have 10 cells in series).

Now the question:
I have a 15v power adaptor (correct voltage) but it is 400mA. I want to 'throttle' it to 250mA somehow. Is there some way i can do this with a diode or resistor or transistor or something?

Cheers