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Alarm.com Video Doorbell 3795 Replacement Battery 3.7V 500mAh

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From $35.99 USD $44.99
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Fits Alarm.com Video Doorbell models C-VDB770, ADC-VDB770-S, ADC-VDB770 as OEM replacement 3795.
3.7V 500mAh lithium-polymer cell delivers steady power for video capture and two-way audio on the doorbell.
Connector is a two-pin JST-type plug with keyed orientation — slides into the battery slot without force.
We cycled this pack on the VDB770 platform and confirmed the BMS accepts the cell on first insertion with clean contact seating.
On first swap, power cycle the doorbell through the Alarm.com app — firmware must re-register the new cell before motion triggers log correctly.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

3.7V

Amp

500mAh

Alarm.com ADC-VDB770 / C-VDB770 Video Doorbell — 3.7V Li-Polymer Replacement Battery (3795)

This 3.7V 500mAh Li-Polymer battery replaces part number 3795 in the Alarm.com Video Doorbell lineup. It fits the ADC-VDB770, ADC-VDB770-S, and C-VDB770 Touchless Video Doorbell models. At 32.40 × 29.50 × 6.00mm, the cell matches the original footprint exactly.

  • ADC-VDB770 and C-VDB770 platform: These models share the same voltage rail, connector pinout, and BMS handshake requirements — one cell covers all variants listed. The 3795 part number is common across the touchless and standard ADC-VDB770 hardware revisions.
  • Bench tested on actual hardware: We ran this cell through charge cycles on the ADC-VDB770 platform and monitored BMS communication during motion-triggered recording events. The protection circuit held voltage within spec across combined IR LED and processor load spikes.
  • First-install power cycle: After fitting this cell, power cycle the doorbell once through the Alarm.com app. The firmware must register the new cell before the motion recording log syncs correctly to cloud storage — skipping this step can cause missed clips after the first trigger.

ADC-VDB770 going offline in the Alarm.com app after battery swap

When the original cell drops below the BMS re-entry threshold, the doorbell loses its session token with the Alarm.com cloud. Fitting a fresh battery restores power, but the firmware does not automatically re-establish that token. The camera appears online at the hardware level but shows as offline or unresponsive in the app. Re-adding the device through the Alarm.com app — or triggering a soft reset via the doorbell's reset button — forces a new token handshake and clears the offline status.

App reporting 0% or incorrect charge level after installing the new cell

The ADC-VDB770 uses a voltage-threshold indicator, not a fuel gauge IC — it reads state-of-charge from cell voltage at fixed reference points, not from charge tracking. When a new cell first powers the unit, the firmware reads voltage mid-ramp and may display 0% or an arbitrary figure. Run one full charge cycle to 4.2V and let the doorbell discharge through normal operation — the indicator recalibrates against the new cell's voltage curve and displays an accurate percentage from that point forward.

Compatible Models

Video Doorbell C-VDB770 Touchless Video Doorbells ADC-VDB770-S ADC-VDB770

Replaces Part Numbers

3795

Technical Specifications

Voltage3.7V
Amp Hours500mAh
Capacity500mAh
Rate1.85Wh
Net Weight11g /0.39 oz
Gross Weight36g /1.27 oz
Approximate Weight36g /1.27 oz
Dimension 32.40 x 29.50 x 6.00mm

Product Highlights

  • Brand: Alarm.com
  • 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 Alarm.com doorbell stops recording mid-clip — what's cutting it off?

A WiFi reconnect during recording pulls a current spike that can trip the BMS protection circuit on a cell already sitting at the lower end of its voltage window. This is more common on weak or congested 2.4GHz signals where the doorbell drops and re-associates mid-event. A fresh 3795 cell with a full charge raises the resting voltage enough that the BMS tolerates the reconnect spike without shutting down. Move the router closer or reduce interference sources if the problem continues after swapping the cell.

Night vision cuts out or the camera sleeps after dark — is that a battery issue?

Sustained IR LED draw at night is one of the highest continuous loads this doorbell puts on the 500mAh cell. If the cell has degraded, voltage sags under that load and the BMS triggers a cutoff before the processor registers it as intentional sleep. The camera appears to sleep or go dark, but it's a protection event, not a firmware sleep mode. Replacing the 3795 cell resolves this — confirm night vision stays active through a full overnight cycle after the swap.

Motion detection stopped triggering after I put in the new battery — recordings aren't showing up in the app.

The combined current spike from the IR sensor, processor wake, and recording start can exceed what the BMS expects if the firmware hasn't registered the new cell yet. This is a firmware session issue, not a hardware fault. Power cycle the doorbell once through the Alarm.com app immediately after installation — the firmware re-registers the cell and the motion event log resumes syncing to cloud storage correctly.

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