Now a replacement battery can be obtained at XINJ store on Aliexpress. It's a 1000mah battery, not 1100mah as the original one, but it would work as a replacement in case Valve refuses to help. Video with controller disassembly up until the battery compartment can be seen here: https://www.youtube.com/watch?v=2p8VTLdd... How to replace the battery with a connector (I'd still go for solderinng tbh): https://www.youtube.com/watch?v=ODQ-un51vKE ______________________ OLD: Info about battery can be found here. https://www.reddit.com/r/ValveIndex/comm... PL802056V 3.8V (model number) 1100mah 4.18Wh (specs) +18100604-1 (this looks to be battery serial number, as I found 2 different ones) More details in my own disassembly: https://www.reddit.com/r/ValveIndex/comm... 10.78x56.86x21.47 in paper fold with rubber pad and expanded chamber and control board (finished battery). 50.59x19.24x9.62 just the normal dimensions without control board and expanded gas chamber (just the cell without wires/board). Model number...