I need some technical help.
I carry 2 battery packs on my trike. I am a redundancy freak and many times I cannot depend on breakdown help and am disabled and can't walk very far. I have a 12ah sla and a 10 ah nihyd onboard.For 95% of my riding, I have found 36 volts to be adequate. However, on one trip that I ride on there is about a mile of steep hills that bog my trike down. It is possible that going to 48 volts might solve my problem. My question is, can I connect just 1 of the 12 volt sla cells with a switch to my nimyd to obtain the 48 volts. Or in the interests of cell balancing should I parallel all three cells and put a switch on that? If the single brick idea will work ,should I recharge the brick by itself or in series with the rest of pack after use? I don't think that my controller would take 72 volts so I don't want to series connect the two packs. Thanks