About this replacement
SkyBell DH Doorbell — 3.8V Li-Polymer Replacement Battery (PLM553443)
This 3.8V, 800mAh Li-Polymer cell replaces the original PLM553443 battery inside the SkyBell DH video doorbell. The SkyBell DH is a hardwired-assist smart doorbell that streams live video and two-way audio for home security. Voltage and physical dimensions match the OEM spec exactly — 45.30 × 33.10 × 5.30mm.
- SkyBell DH fit: The DH model uses a slim Li-Polymer pouch cell on a dedicated 3.8V rail. The PLM553443 cell connects through a board-mounted BMS that regulates charge input from the doorbell's transformer feed. A physically oversized cell will not seat correctly and will stress the flex connector.
- Bench tested on actual hardware: We cycled this cell through the DH's onboard BMS, confirmed charge acceptance from 3.0V to 4.2V, and verified the protection circuit tripped correctly on simulated over-discharge. The BMS handshake completed without fault codes on reconnect.
- First-install power cycle: After fitting the new cell, perform a full power cycle through the SkyBell app. The firmware must re-register the cell before motion event recording logs correctly to cloud storage — skipping this step can leave motion triggers silently failing.
SkyBell DH going offline in the app after a battery swap
Replacing the cell disconnects the doorbell briefly, which drops the active firmware session. When power returns, the SkyBell DH sometimes fails to re-establish its cloud registration automatically. The device will appear offline in the app even though the LED ring shows normal operation locally. Open the SkyBell app, navigate to device settings, and trigger a manual reconnect — the doorbell re-handshakes with the server and restores live view.
App reporting 0% or stuck battery percentage after install
The SkyBell DH uses a voltage-threshold indicator, not a fuel gauge IC. After fitting a new cell, the app reads the resting voltage and maps it to a percentage — but this calibration is off until the cell completes one full charge cycle from the transformer. Let the doorbell charge uninterrupted until the indicator in the app reaches 100%, then allow one normal discharge through regular use. After that cycle, the reported percentage will track accurately against the 3.8V nominal rail.