The only consideration for me to others reading this thread, is that the Duralite 3+1 charger gets pretty warm when I put the 11.1V TX, and three 7.4V RX/Ign. batteries on charge at once. The comparable Fromeco 4 input charger does not get warm to the touch, so it seems to be working more efficiently.

Fromeco batts/charger are a great price - I hope you're able to get them in Australia.