Philips FM-2, Service Manual

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Battery Charging and Maintenance
82 Chapter 8 - Test and Inspection Matrix
Battery Charging and Maintenance
Before attempting to perform any tests, it is important to verify that the battery
is charged and functional.
Using the Battery
You can run the monitor for approximately six hours on battery power at room
temperature of 25
o C from a fully charged battery (with a minimum of two
hours monitoring at 10 o C from a fully charged battery). The age of the battery,
operating temperature and number of recharge cycles affects this. A battery life
cycle is approximately 200 charge/discharge cycles.
Low Power Warning
A low power warning occurs when the battery power is running low. The battery
fuel gauge flashes, and a repetitive audible tone sounds. Remaining monitoring
time is typically 30 minutes with a new battery at room temperature of 25
o
C. In
an older monitor, in which the battery has had a number of recharge cycles, it
may occur when fewer minutes remain.
The warning continues until the low power condition disappears (when you
connect the monitor to an AC power supply) or until the system stops
functioning because of the low power.You cannot silence it, and you cannot
adjust its volume.
The monitor retains any stored fetal traces, even if it shuts down because of lack
of battery power.