Turns on then off. Light from orange to white, no more charge

After doing my own repair attempt, as seen on my posted guide: I found that my specific controller had glue on its battery connector (from the manufacturer; the controller was never opened before). Replacing the battery with a third party didn't exactly solve the issue until I reinforced the connection on the board. It's likely that, if many Index controllers have had bad battery connections during manufacturing the printed circuit boards, the problem may not be the battery but the connection to the battery on the board. Either way, opening up the controller is the only way to solve this issue.