My son has a Pronto M51. Its a newer version. When charging, the 2 lights that indicate that the batteries are charging (the lights are located on the right side of the chair back by the rear wheel) only one light will turn green after fully charged. The other stays red. He has to charge the chair after about 4 hours of use.He's only 17 and it gets very frustrating for him, Batteries were checked and they both have a good charge. What could it be that only the one light turns green and the other stays red?
The lights are working, the batteries aren't. Red indicates power to the charger, and it should be on all the time. Green indicates a full charge, usually. If one or both of the batteries are totally dead, then the charger can't "see" them, and you will get a green light, but you will have dead batteries.
All power chairs use sealed, deep-cycle batteries. Deep cycle batteries, are designed for slow amperage dischare over a long time period, unlike a car battery that throws out a lot of amperage for turning the motor over. That's called "cold-cranking amps", and you can load-test a car battery to see if it will throw out a ton of amps for long enough to start a car. There is NO load tester made, or possible for a deep-cycle battery. A load test requires a 24-hour time period, and a complicated formula.
So, your course is to get some fresh, gel-sealed-batteries. You will need type U-1. Specify, gel-sealed-batteries when you go to the battery shop. A fresh set should get the chair up to about 12-16 mile range, which would be about 3-4 hours running constantly at high speed. Good luck.
Have you checked the batteries with a load tester?
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