What's the easiest way to add another 12 volt battery to a 24 volt set-up to make it 36 volt, I want to do it to the Canadian Tire Izip. I don't mind charging the 12 volt on a seperate charger, can I add the 12 volt by attaching the negative to the positive and the positive to the negative on one of the batteries in the Izip box, and use a trailer type connection between the new 12 volt and the Izip box?
Custom built tourer, custom electric bike, beaters everywhere
You have to run them in series to get 36 volts. Google it for a drawing. BUT, adding 12 volts usually doesn't affect the live of the motor...it's the controller that you might fry. That said I run my 24V hub on a 36V NiCad and it works fine, but it's not an iZip.
Most battery sales shops have small 12V SLA batteries for about $35. You may have to find a charger.
One last thing: If you are uinhappy with the performance of the bike you might be better off flogging it on craigslist and getting a hub motor kit. Something like a 36V Crystalyte will give you neck bending acceleration and a higher top speed into the wind and up hills.