Defibtech DDU-120 Series User Manual
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DAC-530E-EN-BH
If the battery pack is stored outside the unit for an extended period of time, removal of the 9V 
battery will extend the 9V battery’s life. Note that in an emergency situation, the battery pack may 
be used without a 9V battery. If needed, a non-lithium based 9V battery may also be used, but 
standby status indication life will be reduced.
Once the fresh 9V battery is installed, the battery pack status LED should periodically flash green 
to indicate a ready state. If the indicator does not flash, either the battery pack is defective or 
the 9V battery is discharged. Once the battery pack is installed into the unit, the DDU-120 AED’s 
Active Status Indicator should flash green every five seconds.
3.4 Installing and Removing the Battery Pack
The lithium battery pack provides power to the DDU-120 AED. Before inserting the battery pack 
into the AED, the 9V lithium battery should be installed in the battery pack itself as described in the 
previous section.
In an emergency, the battery pack can be used without a 9V battery, but under normal operating 
conditions the 9V battery should be installed. Do not install the battery pack after the expiration 
date printed on the label. The battery pack is non-rechargeable.
A green Active Status Indicator on the label side of the battery pack will blink periodically to 
indicate that the battery pack is ready for use. If the status indicator is not blinking, either the 9V 
status battery has discharged or the battery pack is not suitable for use. If the indicator does not 
blink after a new 9V battery has been installed, the battery pack should no longer be used and 
should be removed from service. When the battery pack is in the AED, a “beep” will provide 
notice that the 9V battery’s capacity is low and that the 9V battery should be replaced.
To insert the battery pack into the DDU-120 AED, 
orient the battery pack so that the label faces up. 
Make certain that the battery opening inthe side of 
the AED is clean and clear of any foreign objects. 
Insert the battery pack into the opening in the side 
of the AED. Slide the pack all the way in until the 
latch clicks. If the pack does not slide all the way 
in, it is most likely inserted upside down. Once 
fully inserted, the battery pack surface should be 
flush with the side of the AED.
To remove the battery pack, push the battery eject 
button on the side of the AED. After the battery 
pack is partially ejected, pull the battery pack out.
