AT&T TL7600 Replacement Battery 3.7V 180mAh Li-Polymer

AT&T TL7600 Series — 3.7V Li-Polymer Replacement Battery (89-1343-00-00)

This 3.7V, 180mAh Li-Polymer battery replaces the original pack in AT&T TL7600, TL7601, TL7610, and TL7611 cordless phone handsets. It matches OEM part numbers 89-1343-00-00, BT190545, BT191545, 80-7927-00-00, and 80-7428-01-00. Swap it in when the handset stops holding a charge or shows low battery immediately after leaving the base.

• TL7600 series handset fit: These models share the same compact Li-Polymer cell format, connector pinout, and BMS handshake with the base station charging circuit. A single cell spec covers the full TL76xx handset lineup without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the TL7600 platform. The BMS accepted the new cell without fault codes, and the base station charging indicator lit correctly on first insertion.
• First-charge protocol for Li-Polymer DECT handsets: After installing this battery, seat the handset in the base and leave it undisturbed for a full charge cycle before use. Pulling the handset off the base early during the first charge can cause the protection circuit to log an incomplete state-of-charge, which shortens usable capacity from the first session onward.

Range dropping on the TL7600 after a battery swap

DECT transmit power on the TL7600 handset draws current in short bursts. If the replacement cell has a higher internal resistance than the original — common in cells that sat in storage — voltage sags under that RF burst load. The handset's transmit power drops to compensate, and you lose range before you lose talk time. A full charge cycle and two to three normal use cycles will lower the cell's internal resistance as the electrolyte settles. If range is still reduced after five cycles, measure resting cell voltage — it should sit at or above 3.7V off the charger.

Handset not pairing with the base after replacing the battery

Removing the old battery from a TL7600 handset cuts power completely, and some DECT handsets lose their base registration when power is fully interrupted. The handset will power on normally but show no link to the base. To re-register, hold the handset's page button or navigate to the pairing menu on the base — the exact sequence is in the TL7600 user guide under "handset registration." Once re-registered, the handset will reconnect automatically on every subsequent power cycle without repeating this step.