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Ezviz DB2C Wireless Doorbell Replacement Battery 3.7V 5200mAh

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From $38.99 USD $47.99
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Fits Ezviz DB2C wireless doorbell; replaces OEM part 18650-03.
3.7V, 5200mAh lithium-ion cell delivers sustained power for motion detection, two-way audio, and continuous video streaming on the doorbell.
Single 18650 cylindrical format slides into the DB2C battery compartment with spring terminals; polarity marked on the cell.
Bench testing shows the BMS accepts charge within two cycles; voltage regulation stays flat under IR LED and WiFi load spikes.
On first install, power cycle the camera through the app — firmware must re-register the new cell before motion recording logs correctly to cloud storage.
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.

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🔹 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.

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⚠️ 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

5200mAh

Ezviz DB2C — 3.7V Li-ion Replacement Battery (18650-03)

This is a 3.7V, 5200mAh (19.24Wh) Li-ion replacement battery for the Ezviz DB2C wireless video doorbell. It slots into the DB2C housing and powers the camera, motion detection, and two-way audio system. Capacity matches the original 18650-03 cell specification.

  • DB2C platform fit: The DB2C uses a single-cell 3.7V Li-ion pack with a specific connector and BMS handshake. This replacement matches that voltage rail and connector pinout so the doorbell's firmware recognises the cell and reports charge state correctly through the Ezviz app.
  • Bench tested on actual hardware: We cycled this battery through the DB2C's motion-trigger sequence, including night vision activation and two-way audio simultaneously. The BMS handled the combined IR LED and processor current spike without tripping into protection mode.
  • First-install power cycle: After fitting this battery, power cycle the doorbell once through the Ezviz app. The firmware must register the new cell before motion events log correctly to cloud storage — skipping this step can cause missed recordings on the first night.

Why the DB2C goes offline in the Ezviz app after a battery swap

When the DB2C loses power completely during a battery change, the device drops its active session token with the Ezviz cloud server. The camera comes back online physically but the app loses its registered connection. This shows as the device being "offline" even though the LED on the doorbell is active. Fix this by opening the Ezviz app, going to Device Settings, and running a soft restart — the camera re-registers within about 30 seconds and resumes live view.

App reporting 0% or frozen charge percentage after battery install

The DB2C uses a voltage-threshold indicator, not a fuel-gauge IC. After fitting a new cell, the firmware maps the resting voltage to a percentage using stored thresholds — if the battery sits near a threshold boundary, the app can display 0% or a stale value. Run the doorbell through one full discharge and charge cycle to let the firmware re-anchor its voltage-to-percentage mapping. After the cycle completes, the displayed percentage should track accurately from 4.2V full down to the low-voltage cutoff at approximately 3.0V.

Compatible Models

DB2C

Replaces Part Numbers

18650-03

Technical Specifications

Voltage3.7V
Amp Hours5200mAh
Capacity5200mAh
Rate19.24Wh
Net Weight96g /3.39 oz
Gross Weight121g /4.27 oz
Approximate Weight121g /4.27 oz
Dimension 67.00 x 39.30 x 19.60mm

Product Highlights

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

Frequently Asked Questions

My DB2C doorbell stops detecting motion at night even though the battery shows charged — what's causing this?

Night vision pulls current from both the IR LEDs and the image processor at the same time. If the cell voltage sags under that combined load, the BMS can trip into protection mode and cut the motion-trigger circuit while leaving the standby indicator on — which is why the app still shows a charge percentage. We saw this on the bench with aged cells that couldn't hold voltage under peak draw. Fit a fresh 18650-03 cell and confirm resting voltage reads above 3.7V before reinstalling.

Recording clips are cutting off mid-motion event — the camera captures the start but stops before the person leaves the frame. What's happening?

Mid-clip dropouts on the DB2C are usually caused by the WiFi radio reconnecting during the recording. The reconnect current spike, layered on top of active video encoding, pushes total draw high enough to trip the BMS protection threshold. This is more common when signal is weak and the radio is repeatedly trying to maintain the connection. Move the doorbell closer to the router or add a WiFi extender, then confirm the recording completes by testing with a motion event directly in front of the camera.

The Ezviz app shows the battery draining from full to low within a day or two after fitting a new cell — is the battery faulty?

Rapid drain on a new cell usually points to the doorbell's activity settings, not the battery. Live view sessions left open in the app, a motion sensitivity set to high in a busy area, or chime notifications triggering repeated wake cycles all draw continuous current that a 5200mAh cell was not sized to sustain at that rate. Check the Ezviz app under Device Settings and reduce motion sensitivity or enable the scheduled recording window. If drain continues after that adjustment, check the cell's resting voltage with a multimeter — a healthy cell should read 4.1–4.2V immediately after a full charge.

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