[Hasselblad the 3rd]

A plea for advice,
Can anyone helpwith a basic problem. When setting up my cp990 I manage to save the settings in 1, 2 or 3. This is useful as I am trying digiscoping for the first time and need to have particular settings. However, when I take the batteries out to recahrge I lose all the saved settings. Is there a way to keep these once the batteries are out. Yesterday, cracking view of Lesser spotted woodpecker through scope and camera. Just about to begin taking pictures when wreteched battery holder decided to open and out fell all 4. All settings obviously disappeared just as rapidly as the LSW. Ho hum
Any suggestions gratefully received. Probably in the handbook, just too lazy to find it.
Many thanks,
Jono