Using this in the 9xr. Didn't even charge it and I have been running with it for weeks now and the charge is still at 11.2. I did buy an extension so the cable is not crushed by the radio.
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I have the 9x, and all you have to do is splice and solder the old connector from the aa battery tray to the new trans pack. i have just recieved mine in the mail, and after soldering the new conncetor, that worked fine. BUT, the battery does not fit inside the transmitter. it is too wide. so with that being said, there will have to be some modifications done to the 9x transmitter, ie: cutting/shaving away some of the cavity where the battery is supposed to go. in my opinion that is the only option using this pack because you really dont want to have to force the battery in to place and risk damage to the transmitter or the battery itself.