Acer AcerNote 950 User Manual page 11

After the utility has discharged the battery pack, the notebook power turns
off. The AC adapter then charges the battery pack. As the battery is being
recharged, the battery LEDs light up from one (0~20 percent) to five (80~99
percent) and turns off at one hundred percent.
We suggest that you perform this function by activating it at
night before retiring, letting it discharge overnight before
traveling. Also, connect an AC adapter to the notebook and to a
power outlet when discharging. This ensures a fully charged
battery for use the next day.
Operating on Battery Power 2-11