RR needs full flash all the time.

[N0DIH]

Look at the leads where it goes into the board, then look at the other side of the board, they should be like a mini socket, should just pull out. mine came uninstalled. IF yours is newer than 2.5 years ago, might want to ask Craig if the batt comes out, but I bet it does. Look for solder down in the sockets/legs for it. Should be 1 lead on one side and 2 on the other. Just don't pry on the board or IC's, they can and will break, and if the bond wires or die gets force, it is all done.....

[mr.prick]

That's how my other one was, it just pulled out and had a leg glued or soldered to it.
This one has the legs soldered to the board and the battery seems to be soldered to the top leg and probably the bottom one too.