On a second point, I'd just go straight to lipo and not worry about the Nimh batteries. Yes, the chemistry of lipos is more complicated, but the use and charging of the batteries is much easier and gives much more use.
For lipos stick to the 1c charging and ideally always balance charge (sounds complicated, but isn't).
Back when I used to race we used nicads and charging just meant plugging into a resistor and heat sink. Sounds easy, but lipos give so much more life that all the old technology just feels a waste of time now!!
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I've got Araldite and a Swiss Army Knife - what more do I need?
Yokomo YZ-2
No 4WD because nothing lives up to my original Optima. Until now maybe?...
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