It is quite possible that the batteries may have been stored away discharged and then left to long before charging, that is the normal problem with deep cycle batteries, if they are not being used they must be charged every four or five weeks or they will get to a state that is not recoverable from
The easiest thing is just to use your car charger and charge them seperatly, then use a meter to check the voltage on each battery, they should be about 13.5volt each, if less than 12 volts after a full charge they will be shot
You can replace the 12v 35ah battery here
http://www.batterytrader.com/12v-35ah-sla-sealed-lead-acid-batteries-p-26530.html
If the batteries seem ok after you have charged them on your car charger and work the scooter then your charger must be faulty, you can get a 12v 4ah mobility charge with 3 pin DIN fitting here
http://www.batterytrader.com/24-volt-ampere-wheelchair-battery-charger-p-38289.html
I hope this helps you and anyone else
Regards
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