HP OmniBook 2100 Reference Manual page 52

Managing Battery Power
Monitoring Battery Power
Charging time
Charging the battery takes about 1.5 hours.
Battery life
When the computer is in use, typical battery life can last up to 2 to 3 hours,
depending on your level of use and your power management settings (see
page 1-14).
Optimum Charging
To get the longest battery operating time, continue charging until the OmniBook
battery is fully charged. Because of rounding, a battery indicator can show a full
battery before it's fully charged. The status panel battery indicator (up or down
triangle) stops blinking only when the battery is actually full.
You can continue working while the battery is charging.
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