Epson LT-286 - Manual (Page 63)

To maximize the charge time your battery supplies, you should
completely discharge and then recharge the battery from time to
time. To do this, let the battery drain all the way down. When the
Power/Speed LED starts to flash, save your work in progress (if
any) and exit any program you are using. Leave the computer on,
but do not use it. After about ten minutes, all LEDs should go dark,
indicating the battery has been discharged. Then give the battery a
full 12-hour charge.
LED Indicators
Above the keyboard on the right side are six LED (light-emitting
diode) indicators that provide information about the computer’s
operation.
The Power/Speed LED is on whenever the computer is on. The
color of this LED indicates the computer’s current execution speed.
If the microprocessor is running at 12 MHz, the light is green; if it is
running at 8 MHz, the light is orange.
The Power/Speed LED serves another important function: it
indicates when the battery charge is low. If this light is flashing, you
should attach the AC adapter as soon as possible to avoid losing
data or save your data files and turn off the computer if AC power is
unavailable. (See “Using the Battery,” above.)
Using the Equity LT-286 4-3