PHILIPS Respironics Trilogy 202 User Manual page 65

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When the device is not connected to an AC power source or an
external battery, the detachable battery will power the device, if
attached. The length of time the ventilator will operate on battery
power depends on many factors such as device settings, battery
charge level, and condition or age of the battery. When fully charged,
a new battery can power the ventilator for approximately three hours
under typical patient conditions.
Whenever the ventilator is connected to AC power, it will
automatically recharge the detachable battery pack. A completely
discharged detachable battery will reach 80% charge status within
8 hours, when charging at approximately 23˚ C (73 ˚ F) ambient
temperature.
Insert and securely latch the detachable battery into the device as
shown below.
Insert
Detachable
Battery
Trilogy 202 user manual
Properly Installed
Detachable
Battery
Attaching the Detachable
Battery
CAUTION
Prolonged operation or storage
at elevated temperatures may
reduce the service life of the
detachable or internal battery
and other internal components
of the ventilator.