Epson 4SLC2-50 - Manual (Page 55)

To reduce the memory effect and extend the life of your battery,
you should let it discharge completely whenever possible before
recharging it. If you use the computer every day, you should
completely discharge the battery at least once a week.
If you find that over time the battery is losing its charge sooner,
the life of the battery may be reaching its end. Try letting the
battery discharge completely; then recharge it. If this fails, replace
it with a new battery pack.
Note
When your battery can no longer be recharged, please contact
your local government agency responsible for hazardous waste
disposal. NiCad batteries are considered hazardous waste and
should be recycled or disposed of properly.
Low Battery Indicator
When the battery’s power is getting low, the low battery light
starts flashing and the computer starts beeping. At this point,
replace it with a fully charged battery or connect the AC adapter.
You need to recharge the battery (as described above) before you
can use it again to power the computer without the AC adapter.
If your AC adapter is not available, follow these steps:
1. Complete your current activity.
2. Save your data.
3. Exit the program you are using.
4. Turn off the computer.
3-6 Powering the Computer