My range kept decreasing. I assumed that it was the batteries. I was ready to either quit with electric, or put large wheel chair catteries in my S-750. Then my Qili charger that came with the scooter quit working. That was almost the final blow. I really did not want to start taking things apart and studying them. I just don't like electrical issues. BUT! I pulled the battery pack out and took the case off. I had a couple old 12v phone charger transformers(they actually put out 13 volts.) lying around. I put red and black alligator clips on them after testing the output to be certain the colors matched those of a big charger that I have for the cars. The phone chargers put out 500 milliamps and 350 milliamps. I charged the batteries separately with those, switching them durring charging to get a near balanced charge. It isn't ideal, but it worked!
My scooter went twice as far as it had been going. Apparently, the Qili charger had not been doing a good job of charging the batteries for some time. Maybe it was never right.
NOW! How long can I leave a 500 milliamp charger and a 350 milliamp charger on without damaging the batteries?
What is the best cheapest charger I can buy that will do the job right and last a lot longer than a year? I only charged my batteries and average of maybe 2-3 times a week. I did not ride the scooter more than 150 times in a year.
Can I put two 12v 20-25 amp wheelchair batteries on my scooter without changing the controler? I understand the difference between series and paralell, so hooking the batteries up is not a problem. Is the amp rating of the controler related to the amps that the motor draws, or the amps that the batteries can deliver? I suspect it is the draw of the motor, but I'm not certain. Locically, my Honda has a 10 amp battery, but small lights are on 5 and 10 amp circuits.