Chapter 9 Periodic Maintenance - Acer HDS AMS200 Reference Manual

Chapter 9 Periodic Maintenance
If the subsystem is not energized for more than three months, the battery may over-
discharge and unrecoverable damage may result. In this situation, the battery must be
energized more than 6 hours at least once every three months or, alternatively, the
subsystem can be stored with the switch of the battery turned off. However, even when the
switch is turned off, the battery discharges naturally. The battery should be charged once
every six months for longer than 6 hours because spontaneous discharge occurs.
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