If issues with the backup battery arise, troubleshooting may help to determine if the battery is malfunctioning. Â This document provides troubleshooting steps for ARRIS TM802 Battery Backup.
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CAUTION: Make sure the VOIP phone is not in use when performing these troubleshooting steps.
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To Troubleshoot the Battery
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Make sure the battery is installed.
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Verify the battery LED on the front.
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If the battery LED is On indicates the battery is good.
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If the battery LED is Flashing the battery maybe malfunctioning.  Proceed to step 3.
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Remove the power cord from the modem.
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If the modem is still powered On, the battery is functioning.
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If the modem is not powered On, proceed to step 4.
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Remove the battery from the bottom of the modem to check for battery corrosion and also the battery connector in the TM802 Modem.
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If there is corrosion found on the battery, the battery needs to be replaced.
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If there is corrosion in the unit or if the battery connector is damaged, replace the damage modem.
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If there is no corrosion or no damage to the battery connector, re-install the battery and power on the TM802 Modem.
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If the issue is not resolved, replace the battery.
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If the battery has been replaced and the unit is still exhibiting the same behavior, the issue could be with the modem and may need to be replaced.
