well, you will want to wire the batteries up in parralell to give 12v but double Amp. Wire both speedos to the same batteries as this will save you alot of weight rather than having two seperate battery packs! The electronize speedos do give forward and reverse control for your motors so there will be no problems in controlling your robot. Are you running 4 gold motors for your drive? i use 2 24v for drive, and a 12v overvolted to 24v on my weapon. i use 3.3Ah NiHm batteries and that gives me enough power for atleast 1 to 2 battles.so that should be fine for you.
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