Yamaha DTXpress/DTXplorer/DTXtreme

Don't know why my first posting didn't display correctly - here is 
another attempt:
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I have one of the first DTXpress sets to be made, and I still had not 
seen the low battery indicator. But being the worry-wart that I am, I 
went ahead and changed it BEFORE  seeing any warnings about it.  I 
actually did a "hot-switch" of the battery and replaced it with a new 
one, and didn't lose any of my user defined kits. I have a feeling if 
you swapped batteries and NOT had the unit powered up, you would lose 
what you had saved.  It's a pretty easy swap, and from the voltage 
levels that seemed to be present inside the unit when powered up, it 
seems to be a safe thing to do. You have to take off the top cover ( 
2 screws on each side, and one in the back) and slide the cover off. 
The battery is located on the main board at the bottom of the unit, 
but you have to take out the 4 screws that hold a half size board to 
be able to access the battery.  You have to unplug all the cables 
since they plug into connectors on that half size board, and you 
can't move the board out of the
  way w/o unplugging the cables.  Once you can see the battery, I 
took a screwdriver that had a magnet on it, and placed it on the 
battery itself, then used a small screwdriver to release the battery 
from the snap-in holder that it's in. Then I just snapped the new one 
in and off it went.

If anybody needs the part number for the battery, I can look that up 
tonight and post it. Good idea to have the battery in advance so you 
don't have to take the thing apart twice, unless you want to leave it 
open and run to the store.  It's a button type battery, available 
from Radio Shack  The one in there is a Japanese battery, but easily 
cross-referenced to a R. Shack part.  I think it was only 3 bucks or 
so... pretty cheap insurance to not lose what you've worked so hard 
to save.

Hope the info helps!