I have two planes that take the same battery. They are older and can't find replacements. The battery is an RFI 1300mAh 11.1V 3S1P 20c lithium polymer with an HXT connector. I took the battery to a local R/C hobby store and the owner said he had nothing to replace it with. He also said he had no idea what kind of connector it was. Is there any way I can find a replacement without having to get a battery and having to change connectors? I also need to get a charger for the batteries.