MiTAC A770, Operator'S Manual

Page: 42 / 107

1-22 System Overview
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When the primary battery pack enters into low battery status, the
system will beep and blinks in DOS mode.
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If Bay 1 or Bay 2 battery is in battery low status system just only
have battery low LED indicate in orange, if primary battery is in
battery low status system will have battery low beep indication.
Battery Charger
The battery charger controls the current to the battery pack to charge batteries
when necessary. The necessity for a charge cycle is usually determined each
time the AC power is applied or the battery pack is inserted and connected to
the system. The battery pack in the A770 can be charged during both the
power ”On” and “Off” stages.
Two charge mode are provided when the AC power adapter is connected to
the system. When the power is “Off”, a fast charge mode is activated with a
constant current for the primary battery pack. The charge time for the primary
battery pack is about 3.5 ~ 4 hours. When the power is “On”, an alternate
charge mode is activated for the primary battery pack with fluctuating current
according to the system load. The alternative charge time for the primary
battery pack is about 5.5 ~ 6.5 hours. As for the auxiliary battery pack, the
charge current is 1.4 ~ 1.6A and the charge time is about 3 ~ 4 hours whether
the power is “On” and “Off”.
NOTE
In some high temperature situation, battery charging may be suspended.
This is intentional designed.