Roland PMA-5 "Backup NG" fixed!

If you've pulled your Roland PMA-5 "Personal Music Assistant" out of storage and are getting a "Backup NG" error, you need to replace the backup battery or you won't be able to save songs. Replacing the battery not has straightforward as it should be, but if you're handy with a soldering iron, this will show you how to do it.
The replacement battery I used can be found here: www.batterytex...
Other suppliers have this battery too, but BatteryTex had the most reasonable shipping charges. Enjoy!