Husky MP2500 Manual page 369

will only support the RAM for typically 2 to 3 days (less if not in its fully
charged state).
All MP2500 and FS3 applications must therefore be written such that data
is frequently saved to disk, as a matter of good practice for data integrity.
On the FS/2, all programs and data/files are stored in SRAM (Static RAM)
with battery backup.
Appendix G: MP2500, FS3 and FS/2: 347