It's tricky, metal tabs are soldered right to the battery terminals. It's a lithium battery so you don't want to heat it too much so desoldering will be annoying and potentially dangerous. What you can do instead is cut both tabs to remove the battery then solder wires to the tabs on the board and connect a proper battery holder. Might need to move the battery outside it since the holder + battery won't fit.

For folks who use words like "desolder" it's not tricky at all.

This (and the Dash) come in a glued shell with a 1.5v Energizer Li AAA solder-welded to the back. Getting inside without completely destroying the curb-appeal takes a hex bit, some scraping, and a little patience.

Once you get to the board, the battery is easily replaced with a LiPo. The MCU is 3.3v, but Amazon Prime has you covered on cheap LDO/buck converters (like, "a buck" converters).