I agree with all the comments posted so far.
the way chargers charge Nicads and NiMh is by looking for a small voltage drop (deltaV) which tells the charger that the cells are full. If your speedo is connected and on, including other loads via the receiver, this could well confuse the hell out of the charger meaning you wont be able to fully charge or massively overcharge the batteries.
Also even the slightest load for a long time will definitely flatten the batteries to a point where they can be damaged.
Finally, removing any mechanical way of disconnecting your batteries from your car introduces the possibility that you could end up ruining everything in the event of any damage/electrical failures which do happen.
I have to ask, what were your justifications for doing things this way in the first place, your either in need of a lot of help from your local shop/club or you are winding us up!
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