Battery won't hold a charge - go-go elite travellor scooter battery charged overnight but won't hold charge.

We have had problems with scooter batteries from time to time and the repair man said to take apart the battery case and disconnect the batteries and use a car charger. I put the two battery in parallel and used a amp battery charger. This worked fine.
Don't run your scooter batteries all the way down when using the Go Go as the scooter charger won't always bring them up to full charge and you may have repeat this. Also running the batteries all the way down shortens there life.

More than likely duff batteries. Will it hold its charge if the batteries are taken off the scooter (i.e. remove the battery pack)? If so, it could be a short somewhere in the wiring of the scooter although I would have to say that this would be unlikely.