This model of the Telephony Modem has the ability to provide battery backup in the event of a local power loss. The battery backup is not intended to take the place of AC power. Depending on the model, one or two lithium-ion batteries can be inserted into the Telephony Modem. Some modems support two batteries, if using one battery, it must be inserted into Bay 1. This document describes how to install and to replace the backup battery for the TM4 series.
NOTE: The Telephony Modem will not begin operating until you apply AC power.
Pull down on the two latches holding the battery door (on the bottom of the Telephony Modem) and pull the door toward you. Set the door
aside in a safe place.
Hold each battery by its pull tab and insert the batteries into the bay.
NOTE: The image shows the proper orientation. Batteries will not insert completely into the Telephony Modem if not oriented correctly. It must be inserted into Bay 1 as shown.
Push the battery into the bay until it latches into place.
NOTE: The image shows a Telephony Modem with both batteries installed.
Replace the door. To do so, place the tabs of the battery door into the slot on the Telephony Modem battery compartment. Rotate the door
away from you until the two latches snap back into place.