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Ring Video Doorbell 2nd Gen S1 Replacement Battery 3.8V 4200mAh

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From $26.99 USD $33.99
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Fits Ring Video Doorbell 2nd generation, replaces OEM part number S1.
3.8V and 4200mAh capacity delivers sufficient energy for live streaming and motion-triggered recording cycles on this wireless doorbell.
Connector inserts vertically into the battery slot; no locking tab — seat firmly until flush with the housing.
We bench-tested this cell in the doorbell platform; BMS accepted the pack on first insertion with no fault codes or voltage dropout.
On first power-up after installation, open the Ring app and power-cycle the doorbell once — firmware must re-register the new cell to log motion events correctly to cloud storage.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.8V

Amp

4200mAh

Ring Video Doorbell 2nd Generation — 3.8V Li-Polymer Replacement Battery (S1)

This 3.8V, 4200mAh Li-Polymer cell replaces the original S1 battery in the Ring Video Doorbell 2nd Generation (model 5UM5E5). It fits the removable battery module that slides out of the doorbell base for charging. Voltage and capacity match OEM spec exactly — 3.8V nominal, 15.96Wh.

  • Video Doorbell 2nd Gen and 5UM5E5 fit: Both model names reference the same hardware platform. They share an identical battery bay geometry, connector polarity, and 3.8V BMS handshake — one cell covers both.
  • Bench tested on actual hardware: We cycled this cell through motion-triggered recording loads on the Video Doorbell 2nd Gen. The BMS held stable under the combined current spike from the IR LEDs, processor, and WiFi radio firing simultaneously on a motion event.
  • Firmware registration after install: On first install, power cycle the doorbell once through the Ring app. The firmware must register the new cell before motion-triggered clips log correctly to cloud storage — skipping this step can cause missed recordings even when the doorbell appears online.

App showing 0% or an incorrect charge level after battery swap

The Ring Video Doorbell 2nd Gen reads battery level using a voltage-threshold indicator — not a fuel gauge IC. When a new cell is installed at a mid-state-of-charge, the firmware maps that voltage to an estimated percentage that may read incorrectly until calibrated. Run the battery down to the low-battery alert, then charge it fully in the removable module using the included cable. After one complete cycle, the voltage thresholds align and the app percentage tracks accurately.

Recording stops mid-clip or motion events are missed entirely

On a weak WiFi signal, the doorbell's radio repeatedly reconnects during a clip, drawing a current spike that can trip the BMS protection circuit mid-recording. This shows up as truncated clips in the Ring app history or gaps where motion was clearly detected but no video saved. Move the router closer or add a Ring Chime Pro as a signal extender to reduce reconnect frequency. The BMS resets automatically — confirm signal strength in the Ring app's Device Health screen is reading "Good" or above.

Compatible Models

Video Doorbell 2nd Video Doorbell 2 Generation 5UM5E5

Replaces Part Numbers

S1 1ICP6/5056-2

Technical Specifications

Voltage3.8V
Amp Hours4200mAh
Capacity4200mAh
Rate15.96Wh
Net Weight60g /2.12 oz
Gross Weight85g /3.00 oz
Approximate Weight85g /3.00 oz
Dimension 54.70 x 49.70 x 10.50mm

Product Highlights

  • Brand: Ring
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Ring Video Doorbell 2nd Gen went offline in the app right after I put the new battery in — how do I get it back?

Swapping the battery clears the active firmware session, so the doorbell loses its registration state with the Ring server. Open the Ring app, go to Device Health, and tap "Reconnect to WiFi" to force a fresh session handshake. You do not need to fully re-add the device — the reconnect flow re-establishes the token without resetting your motion zones or clip history. The doorbell should show Online within 60 seconds of completing that step.

Night vision cuts out after dark and the camera looks like it's sleeping — what's draining the battery that fast?

Sustained IR LED draw at night runs significantly higher current than daytime video-only operation. If the battery cell has developed shallow-cycle degradation — where it was never fully discharged and recharged — its usable capacity at low-current loads is disproportionately reduced. Remove the battery module, charge it fully via the USB cable until the indicator shows complete, then reinstall. If night vision still drops out, check the Ring app's Device Health battery percentage at dusk — anything below 20% before dark means the cell needs a full conditioning cycle before it can sustain overnight IR operation.

The motion alerts stopped triggering even though live view still works — is that a battery issue?

Motion detection fires the IR sensor, processor, and WiFi radio simultaneously, creating a combined current spike that can exceed the BMS threshold on a partially discharged or recently installed cell. When the BMS trips on that spike, the doorbell stays online for passive live view but kills the motion trigger circuit to protect the cell. Charge the battery module to 100% and reinstall, then perform a power cycle through the Ring app so the firmware re-registers the cell at full charge. If the dropout continues, confirm in Device Health that RSSI (signal strength) is better than -60 dBm — a weak signal amplifies the radio current spike on every motion event.

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