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Old 04-03-09, 07:57 AM
put our Heads Together
cerewa's Avatar
Join Date: Jun 2003
Location: southeast pennsylvania
Posts: 3,155

Bikes: a mountain bike with a cargo box on the back and aero bars on the front. an old well-worn dahon folding bike

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Just a note - if you are connecting batteries in series, you should add a battery that has the same number of amp hours and the same chemistry.

So if you have a battery that's 24V 10Ah Lead Acid, you could add a 6V 10Ah Lead Acid battery or a 12V 10Ah Lead Acid battery, or some other voltage, but keep the amp hours the same.

E-bikes that are sold as 24 volt bikes usually have parts in their controller that can't take 36 volts day in day out and not break.

You should either research the particular controller to find out if its internal parts can handle the voltage, or buy a controller that is appropriate for your motor, or accept that adding 12 volts to your 24 volt bike means that your controller could quit working at any moment. If you want, you could plan on just buying another controller if yours breaks - they're a lot cheaper than a whole e-bike.
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