About this replacement
SkyBell Trim Plus WiFi Video Doorbell — 3.7V Li-Polymer Replacement Battery (SNO-602535P)
This is a 3.7V, 500mAh Li-Polymer battery for the SkyBell Trim Plus WiFi Video Doorbell. It replaces OEM part SNO-602535P directly. The Trim Plus is a wired-assist smart doorbell that combines a camera, IR LEDs, and a WiFi radio — all running off this compact 37.00 × 25.10 × 6.00mm cell.
- Trim Plus platform fit: The Trim Plus packages its processor, IR emitters, and WiFi module into one tight assembly. All three share the same cell. Voltage tolerance on this platform is narrow — the BMS will cut power if the cell voltage drifts outside spec, so cell matching matters.
- Bench tested on actual hardware: We ran this cell through motion-trigger cycles and sustained IR recording loads. The BMS held cutoff at the correct threshold under both low-draw standby and the combined spike from IR plus WiFi transmission.
- First-install power cycle: After fitting this battery, force a full power cycle through the SkyBell app before relying on motion alerts. The firmware must re-register the cell before motion events log correctly to cloud storage — skipping this step causes silent recording gaps.
Camera going offline in the SkyBell app after battery swap
Swapping the battery clears the active firmware session on the Trim Plus. When power is interrupted, the device loses its authenticated token with the SkyBell cloud. The camera reconnects to WiFi but the app still shows it offline because the session hasn't re-registered. Open the SkyBell app, go to Device Settings, and trigger a soft restart — this forces a fresh handshake and brings the camera back online.
App showing 0% or stuck percentage after installing a new cell
The Trim Plus uses a voltage-threshold indicator, not a fuel-gauge IC. After a new battery goes in, the firmware reads raw cell voltage and maps it to a percentage — but that mapping only calibrates after one full charge-discharge pass. Until then the app can report 0%, 100%, or a frozen number. Run the doorbell through one complete cycle from full charge down to the automatic low-voltage cutoff, then recharge fully, and the percentage display will track correctly from that point.