About this replacement
Marmitek DoorPhone 170 / 210 Series — 3.7V Li-Polymer Replacement Battery (8269)
This is a 3.7V, 850mAh Li-Polymer cell for the Marmitek DoorPhone 170, DoorPhone 210, and VDP210BP wireless video doorbell systems. It replaces OEM part numbers 8269 and 28253. The battery sits in the doorphone handset or base unit and powers the video, audio, and wireless communication circuits.
- DoorPhone 170, 210, and VDP210BP compatibility: All three models share the same 3.7V Li-Polymer cell format, connector pinout, and BMS communication protocol. Swapping between variants does not require any firmware change or hardware modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the DoorPhone platform. The BMS accepted the cell without fault flags, and the protection circuit responded correctly to both full charge cutoff and low-voltage discharge events.
- Post-swap power cycle on first install: After fitting the new cell, power the doorphone off and back on fully before pairing or testing the chime. The system's motion and call-trigger logic re-initialises on a clean boot — skipping this step can cause missed ring events on the first few presses.
DoorPhone 170 going offline in the app after a battery swap
When a new cell is fitted and the unit powers back up, the doorphone establishes a fresh network session. If the app still holds the previous session token, it treats the device as unresponsive and shows it offline. This is not a battery fault. Open the Marmitek app, remove the device from the device list, and re-add it using the standard pairing flow. The unit should come online once the new session token is registered.
App displaying 0% or incorrect charge level after installation
The DoorPhone 170 uses a voltage-threshold indicator to estimate charge level — not a fuel gauge IC. Fitting a new cell at a mid-range state of charge can confuse the threshold map, showing 0% or a stale reading. Run the battery down until the low-battery alert triggers, then charge it fully without interruption. After one complete cycle the voltage thresholds reset and the app percentage tracks correctly. The full-charge cutoff sits at approximately 4.2V on this cell.