Technaxx TX-59+ Monitor Replacement Battery 3.7V 3100mAh

Technaxx TX-59+ Monitor Wireless Door Phone — 3.7V Li-Polymer Replacement Battery (TE4653)

This 3.7V, 3100mAh Li-Polymer cell replaces the TE4653 battery in the Technaxx TX-59+ Monitor Wireless Door Phone and TX-59 series wireless video intercom units. It powers the monitor display, speaker, and wireless receiver circuit that handles live door camera feeds. Voltage and capacity match the original spec exactly — no modification needed to fit the battery bay.

• TX-59 and X-59+ monitor compatibility: The TX-59, TX-59+, and X-59+ drahtlos share the same monitor PCB, battery bay dimensions, and 3.7V power rail. The TE4653 part number covers all three. One cell swap covers any unit in this range.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the TX-59+ monitor board. The BMS held charge cutoff cleanly at 4.2V and triggered low-voltage protection at the correct floor — no erratic shutdowns during the video feed load test.
• First-install power cycle on the monitor unit: After fitting the new cell, power the monitor off completely, wait ten seconds, then power it back on. The firmware re-registers the battery state on cold boot — skipping this step can leave the charge indicator stuck at the previous battery's last reading.

Why the TX-59+ monitor goes dark mid-session after a new battery install

The TX-59+ monitor draws a combined load from the LCD backlight, wireless receiver, and speaker amplifier simultaneously when a door press event triggers. On a degraded or poorly matched cell, this combined spike can push the BMS into overcurrent protection, cutting the display mid-session. The TE4653 cell is rated to handle that peak draw without tripping the protection circuit. If the monitor still cuts out after fitting this battery, check that the battery connector is fully seated — a partially connected cell increases internal resistance and mimics a weak cell under load.

App or monitor showing 0% charge or wrong percentage after battery swap

The TX-59+ uses a voltage-threshold indicator, not a fuel gauge IC — it reads state of charge from cell voltage alone, not tracked charge cycles. When a new cell is installed, the firmware's last stored voltage reference no longer matches the actual cell, so the display can report 0% or an incorrect level. Run one complete charge from flat to full after install. The indicator recalibrates to the correct voltage thresholds once the cell has been through a full cycle and the monitor reads a stable 4.2V at top of charge.