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Revision B
10 GoodKnight 420G - Patient Manual
Installing an external battery
The GoodKnight 420G can be powered by a 12-Volt car battery by using a special cable provided for
this purpose. The device can be used for 8 hours at least with a fully charged car battery in normal
operation conditions.
CAUTION
• Do not use any battery power cable other than the optional battery cable specific to the
GoodKnight 420G. There is a risk of damaging the device and your battery.
• Only use 12-Volt DC sources and make the proper polarity connections (+ and -).
To install the battery cable, substitute the following steps for steps 4 and 5 of the standard installation
procedure:
1. Connect the battery power cable onto the supply connector at the back of the device. (See
reference 6 in Figure 4, page 5).
2. Connect the other end of the cable directly onto the battery.
NOTE
Before using the battery, always be sure it is fully charged.
The GoodKnight 420G can be powered through a vehicle cigarette lighter by using the cable provided
for this purpose.
To do so, replace steps 4 and 5 of the standard installation by the following steps:
1. Connect the battery power cable onto the supply connector at the back of the device. (See
reference 6 in Figure 4, page 5).
2. Connect the other end of the cable directly onto the cigarette lighter-plug.