Recommended Practices For Power Management - HeartWare Ventricular Assist System Patient Manual

When one battery is depleted to less than 25% capacity, the controller will automatically switch to
the other battery. An intermittent "beep" will sound, the Alarm Indicator (
message will be displayed to replace the depleted battery (Figure 12). If the battery is NOT changed
within 5 minutes, the alarm volume will escalate until the battery is exchanged with a fully charged
battery.
Battery Indicator
Controller Display
When a depleted battery is not exchanged and there are only a few minutes of battery time
remaining in both batteries, a high priority alarm will sound, the Alarm Indicator will be flashing RED
and the message on the Controller Display will read "Critical Battery." If this happens, there are only
a few minutes of power remaining before the pump stops. The batteries should be exchanged
immediately.
6.3.5 Recommended Practices for Power Management
Check your batteries throughout the day. Pay attention to any unusual activity.
 The HeartWare® System's expected behavior is as follows: A controller alerts and
changes to the second power source only when the battery has less than (<) 25%
capacity (1 indicator light) remaining.
 The HeartWare® System's abnormal behaviors are as follows:
o Abnormal behavior: A controller changes to the second battery when the first
battery has greater than (>) 25% capacity (2 or more indicator lights) still
remaining.
Action: Replace the first battery and remove from service.
o Abnormal behavior: There is sudden change in charge capacity on a battery (for
example, a sudden change from 4 lights to 1 light).
Action: Replace the abnormally behaving battery and remove from service.
o Abnormal behavior: You hear "beeping" and the controller rapidly switches back
and forth between batteries.
Action: Replace the battery with more indicator lights first, then replace the
battery with fewer lights. Remove the battery with more lights from service as
it may be a faulty battery.
Figure 12: Controller Display with a Low Battery Alarm
HeartWare® Ventricular Assist System Patient Manual
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) will be yellow, and a
Active Battery Indicator
Alarm Indicator