Here are some photos showing how to replace the battery on a Wyze WVCR200S robot vacuum.
Invert the vacuum and remove the main roller brush.
Remove the 4 Philips head screws holding the battery cover.
Remove the battery cover exposing the battery.
Lift the battery straight out being careful not to yank the wires out.
Disconnect the connector by squeezing the latch.
Assembly is the reverse of disassembly. The wiring from the battery to the vacuum needs to be tucked in so the covers will close.