Epson LT - 286e - Manual (Page 40)

Remember the following when you are charging the battery:
Use only the AC adapter that comes with the Equity
LT-286e. Using a different adapter can damage the
computer and/or the battery pack.
Charge the battery for at least eight hours. If you charge the
battery for short periods, it runs low sooner.
The length of time the battery provides power after being
charged depends on how you are using the computer. A fully
charged battery provides approximately one to four hours of use.
If you are working with a program that makes extensive use of
the hard disk or if you are using the diskette drive, you may
need to recharge the battery sooner.
To increase the amount of time you can operate the LT-286e
using the battery, follow these guidelines:
Lower the brightness of the backlight to its lowest level.
Use the brightness lever on the right side of the screen.
Select a clock speed of 8 MHz. Set the CLOCK slide switch
on the bottom of the computer.
Using HDDPSAVE, turn off the hard disk drive when you
are not using it. Remember that powering up the hard disk
drive uses power, so set a realistic time period for the power
to be turned off.
Using SETLCD, turn off the backlight to the LCD when
you are not using the keyboard.
Using the Equity LT-286e 2-3