1 battery - most likely a battery pack, either 24v or 36v, but one unit
2 batteries - uses 2 12v batteries in series to make 24v.
3 batteries - the same as above, but will make 36v
4 batteries - same as above, but will make 48v.
you can charge one of 2 ways
1 with a charge that is rated for the voltage your batteries put out, either 24v, 36, or 48v. this charge would come with the unit you bought or you could buy and another one from tncscooters.com and pick the one you need.
2 this way is a little harder but achieves the same result. you can get a charger from wal-mart, i recomend the schumacher companion, or the schumacher 600a.
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companion and all it comes with.
i swap out the charer ends(the ones with the rings and put on some female spade connectors to charge my batteries. this shows how they come in the box and what i did to them.
i made these pigtails up to charge multiple batteries and it easily plugs into the charger ends i put on my companion.
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each charger has there advantages, but either will work if you need to pull the batteries out (since this is modifiedelectricscooters, that might be nessecary) and charge them.
Speed, Distance, Torque... Pick any 2