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1) Yes it will work but it's not recommended. You're safer going with 1 type of battery. 2 NiMH or 2 NiCD
2) Probably no difference between using 2 NiMH vs 2 NiCD unless you fully charge the batteries to it's maximum charge capacity (which you most likely will not do)
3) Yes, you can keep your stock charger but you have to mod it so the charging base/wires go directly to the battery.
4) Are you asking how much time it takes to charge 2 batteries? Probably forever if you don't put more voltage to the car by not building a separate charger.
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