The Black Box 24v 8 amp reverse polarity charger is ideal for charging AGM/Gel batteries up to 100ah .

Specifically, on TGA scooters

It has a standard round 3 pin socket (Wired reverse polarity) and features an intelligent 3 stage charging profile which ensures the battery is charged 100%.  An integral fan helps maintain the chargers temperature, and a simple 3 “traffic light” system shows the chargers progress.