Thanks for using JustAnswer.Please backup your data as soon as possible.
It is always good to have a back-up anyway, you never know when you might need it due to "low battery". If you have a computer based sequencer, enable sysex data recording, and dump the contents of the XP.
Most synth's access is via the bottom metal plate. So lay the keyboard upside down on a sofa, or bed. Then remove the necessary screws to allow you inside.
If your lucky, the battery will be staring back at you on the main circuit board. Roland normally use battery holders, so it should be a simple case of sliding out the old, and in with the new. Be sure to note which side the battery is mounted for polarity issues.
If your unlucky, the battery is mounted on the other side of the main circuit board, so you may well need to remove a few cables, and more screws to enable you to remove the board, and get to it. Korg like having their batteries on the other side of the boards.
I've had batteries soldered to the circuit boards too (Yamaha SPX-90 processor), these are tricky to deal with, but not impossible. As I said, Roland normally use battery holders, so you shouldn't have that to deal with.
Please note that the Roland-D110 disassembly process is totally different.
As I have worked with the XP-10 and D110, the disassembly process are completely different.
You can purchase the backup battery here
. Or pop into Asda, Tesco or Maplin and purchase a 3.0v CR2032 lithium CMOS battery. I got mine from Maplin.
I hope my instructions are informative.
Edited by iMayne on 6/13/2010 at 2:10 PM EST