Hmmm. But as you mentioned what happens if you plug a discharged pack in parallel with a fully charged pack. The charged pack will try and dump as much current as it can into discharged pack, possibly damaging it. At the very least it would get very hot. You probably know how hot a 7.2V Nicad pack can get after 10 minutes discharging in an RC car.

I'm no expert on batteries though.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)