Epson 2000 - Manual (Page 97)

Internal Battery Problems
The screen displaysan error message prompting you to run
SETUP when you start your system, or your system displays
as incorrect time and date.
If your system has not been used for an extended period of
time, your internal NiCad backup battery may be discharged.
First, run SETUP to enter the correct time and date. (You may
also need to re-enter your computer’s configuration
information.) See Chapter 1 for instructions. Then, keep your
system running for several hours to recharge the NiCad battery.
5-14 Troubleshooting