Ultrauser56
The remote is pretty easy to pry open. (just use something sharp and start near the purple Roku tag. Work around the case slowly and you will feel the tabs release. Then just unplug the battery. (wiggle the plug, not the wires).
Once these batteries begin to overheat, there really is no fix other than replacement. (although not in Roku remotes, I have had these similar battery packs overheat and actually catch fire so placing the remote outside was a good idea.)
This battery 3.8v 1600mah 34451 battery does not seem yet available for seperate purchase online easily so would recommend you start a warranty claim. https://support.roku.com/article/208757058
The batteries for the older Voice Remote V1 are available for seperate purchase (822048/BG047) from third parties but is a different battery than the backlit v2 unfortunately.
Perhaps RokuMaryEF or RokuTakashi can offer some assistance to expedite.
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