Heng long RC tanks

All 3 have their own remote. Only have 1 battery. Comes with a spektrum DX6i programmable remote. No tanks are programmed to it. No idea how to do that myself. The leopard and challenger are great and like new. The T-90 is one i tried upgrading myself and failed miserably. Its works but for some reason on the remote forward the directions are backwards. It has lots of expensive gearboxes and motors internally but ive completely given up this hobby. Been sittin way too long. Like i said the challenger and leaopard are great. They are factory upgraded versions that already have metal gearboxes, suspension, tracks and roadwheels and upgraded motors. Havent touched them in 2 years so they should go to someone else who will enjoy them like i once did. New upgraded i beleive are like $340 a piece Have a small bag of extra parts i found. Just no time or interest sadly. 500 bucks takes it all. Would like it all to go as a package. Thanks for looking