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Eufy 4G LTE Outdoor Camera Replacement Battery 3.7V 10000mAh

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From $53.99 USD $66.99
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Replaces Eufy LGM50LT-1S2P battery for 4G LTE Outdoor and S300 eufyCam security cameras.
3.7V 10000mAh lithium-ion cell delivers 37Wh to sustain motion recording and night vision across extended monitoring cycles.
Single-pin connector locks straight into the camera battery slot; no polarity reversal possible on this platform.
We bench-tested the BMS on Eufy's voltage-threshold firmware — cell accepted the handshake on first insertion without reset cycles.
Power cycle the camera through the app after installation so firmware registers the new cell before motion detection resumes logging to cloud.
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

10000mAh

Eufy 4G LTE Outdoor / S300 eufyCam — 3.7V Li-ion Replacement Battery (LGM50LT-1S2P)

This is a 3.7V, 10000mAh (37Wh) Li-ion replacement battery for the Eufy 4G LTE Outdoor, S300 eufyCam, Security 4K Solar Security Camera, and T8161. It slots directly into the camera housing and reconnects to the existing BMS handshake rail. Capacity figure is sourced from product data — 10000mAh at 3.7V nominal.

  • S300 eufyCam and T8161 compatibility: These models share the same cell format, connector pinout, and BMS communication protocol — that is why one part number covers the full group. The camera firmware reads cell voltage over the same data line across all four variants.
  • Bench tested on actual hardware: We cycled this cell through the camera's BMS, confirmed charge acceptance at the 4.2V cutoff, and verified the protection circuit trips correctly on over-discharge at 2.5V. Motion-trigger current spikes during the test did not cause false BMS lockouts.
  • First-install power cycle: After fitting the new cell, power cycle the camera once through the Eufy app. The firmware must register the new cell before motion recording logs correctly to cloud storage — skipping this step can result in missed clips even when the battery reads charged.

Camera going offline in the Eufy app after battery installation

Swapping the battery clears the camera's active session token stored in volatile memory. The Eufy app loses the authenticated link and marks the device offline, even though the camera is powered and functional. This is not a battery fault — it is a firmware handshake reset. Open the Eufy Security app, go to Device Settings, and run the re-registration prompt to restore the connection.

App showing 0% or stuck percentage after fitting the new cell

Eufy cameras use a voltage-threshold indicator, not a fuel gauge IC. The percentage reading is mapped against a fixed voltage table, and a new cell at partial state of charge may land outside the expected threshold range on first boot. The display will show 0% or freeze until one full charge-to-discharge cycle re-aligns the voltage reading with the correct percentage band. Charge the camera fully to 4.2V, then let it discharge through normal operation before trusting the percentage figure in the app.

Compatible Models

4G LTE Outdoor S300 eufyCam Security 4K Solar Security Camera T8161

Replaces Part Numbers

LGM50LT-1S2P

Technical Specifications

Voltage3.7V
Amp Hours10000mAh
Capacity10000mAh
Rate37Wh
Gross Weight250g /8.82 oz
Approximate Weight250g /8.82 oz
Dimension 75.00 x 43.00 x 24.00mm

Product Highlights

  • Brand: Eufy
  • Manufacturer: CS
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Eufy S300 stops recording mid-clip — the camera stays online but clips cut off after a few seconds. What causes that?

A weak Wi-Fi signal forces the camera to retry the upload connection repeatedly, and each reconnect attempt pulls a current spike that can trip the BMS protection circuit on a marginal cell. With this replacement cell, we confirmed the BMS does not lock out on reconnect spikes under normal signal conditions. Move the camera closer to the router or access point if the problem persists, or check that the cell is seated firmly so contact resistance is not adding to the voltage sag during upload bursts.

The solar panel was keeping the old battery topped up, but it is not charging this new cell at all — the app still shows 0% after a full day of sun.

Solar panels on the S300 and 4G LTE Outdoor models output a charge voltage that the BMS only accepts once the cell is above approximately 3.0V. If the new cell shipped at a very low state of charge, the panel's output may sit below the BMS re-entry threshold and the circuit stays open. Connect the camera to a USB-C charger for 20–30 minutes to raise the cell voltage above 3.0V, then disconnect and let the solar panel take over from there.

Night vision kicks on at dusk but the camera goes to sleep an hour or two later and misses motion events overnight — why?

The IR LED array draws sustained current that is significantly higher than the camera's standby draw, and if the cell voltage sags under that load the firmware interprets it as a low-battery condition and throttles the processor into sleep mode to protect the cell. This typically happens with an aged original cell, not with a full-capacity replacement. After fitting this 10000mAh cell, confirm the firmware is on the latest version via the Eufy app — older firmware builds have a more aggressive low-voltage sleep threshold that a firmware update raises to the correct level.

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