Respironics BiPAP Focus Operator's Manual page 39

3. If AC power is unavailable, store the ventilator with ON/OFF
switch set to OFF (O) and disconnected from AC power.
Always recommended:
Battery charging and
storage
®
BiPAP Focus™ Noninvasive Ventilator System
1027404 Rev K
Not recommended:
Battery NOT charging
Figure 19: Battery Charging and Storage
Recommended only if AC
power is unavailable
X
Operation
33