Ive got a HTC Sensation wall charger and that is the only charger i have used to charge my T1. Works fine and no worries.
the output on the HTC wall unit is 5V 1A which is the same if specs if you were to buy the sony wall charger for the T1 so no worries with damaging the battery.
If your worried just look on the plug part of the charger and it will tell you the output of the unit.
