ResMed Astral User Manual page 6

Using and recharging the External Battery
When connected to Astral and mains power, the External Battery recharges (refer to the Charging
sequence section in this guide).
Using and recharging with the Astral device
Connect a fully charged External Battery to the Astral device to provide up to a total of 16 hours
power during typical use.
Refer to illustration B.
1. Connect the External Battery DC output cable into the DC input port of the Astral device.
2. Connect the AC power supply cable to the DC input port of the External Battery.
3. Plug the other end of the AC power supply cable into the mains power outlet. The AC mains
indicator on the Astral interface will illuminate.
Using two External batteries with the Astral device
Connecting a fully charged External Battery to the Astral device can provide 8 hours of power
during typical use. A second fully charged External Battery can be connected to the Astral device to
provide a further 8 hours of power during typical use. A maximum of two External batteries can be
connected to the Astral device.
CAUTION
Do not attempt to connect more than two external batteries. Battery specific messages and
alarms on the Astral device will not operate for any additional units.
Refer to illustration C.
1. Connect the first External Battery DC output cable into the Astral DC input port.
2. Connect the second External Battery DC output cable into the DC input port of the first External
Battery.
3. Connect the AC power supply cable to the DC input port of the second External Battery.
4. Plug the other end of the AC power supply cable into the mains power outlet.
Charging sequence
1. The internal battery of the Astral device is charged first.
2. Once the internal battery is fully charged, the External Battery (Battery 1) is charged next.
3. If a second External Battery (Battery 2) is connected, it is charged after Battery 1 is fully charged.
Note: The batteries are discharged in the reverse order (ie, the internal battery is discharged last).
Setting up for mobile use
The External Battery is ideal for mobile use (ie, with a wheelchair) when backup power for the Astral
device may be required. In mobile situations, regularly check the charge on the External Battery.
Battery 1 Battery 2
8 hrs
+
4
+ 8 hrs