RuggedBook 750 Series, Руководство пользователя

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Your battery now has 1 ~ 2 minutes of battery charge remaining. You
must save your data or connect AC power immediately; otherwise,
you may lose your data.
When there is only one minute of battery charge remaining, the
computer will suspend to the HDD and power off. You should
connect AC power and resume your work.
Small Battery for the Real Time Clock
There is a small built-in battery pack that supplies power to the system
in order to maintain certain system information while the power is off.
If the computer is left without a power source for long period of time,
this battery will be exhausted and system information will be lost.
One may expose to danger if battery is incorrectly
replaced. Replace only with the same or equivalent type recommended by
the manufacturer. Dispose of used batteries according to the
manufacturer's instructions. Never remove the battery pack while the
power is on as this may result in data loss when the system loses power.