RE: 12V charger for 9.6V battery?
You really need a "proper" charger - a wall charger at 50mA would do, but you should get an AC to DC power supply (maybe 13.8v, 10A) and a dedicated DC charger suited to NiCd and NiMh. Then you can charge Nixx flight packs as well as your Tx pack. If you intend to get into Lipo's get a Universal Charger which can cope with all battery chemistrys.