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LG Watch Urbane 2nd Edition LTE BL-S7 3.85V Replacement Battery

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From $26.99 USD $33.99
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Fits LG Watch Urbane 2nd Edition LTE with OEM part number BL-S7 replacement.
3.85V lithium-polymer at 400mAh powers the display, processor, sensors, and LTE radio.
Connector seats into the magnetic charging cradle on the watch's rear housing.
We bench-tested the BMS on LG's stock charger — fuel gauge calibrated across full discharge cycle without fault codes.
After fitting this cell, place the watch on its charger immediately and run a complete charge to 100% before first use — the fuel gauge IC cannot establish voltage reference without a full cycle from near-zero after a cell swap.
Delivery time

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

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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.

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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

3.85V

Amp

400mAh

LG Watch Urbane 2nd Edition LTE — 3.85V Li-Polymer Replacement Battery (BL-S7)

This is a 3.85V, 400mAh lithium-polymer cell replacing the BL-S7 in the LG Watch Urbane 2nd Edition LTE. It fits W200, W280, and W280A variants. The cell powers the AMOLED display, Snapdragon 400 processor, heart rate sensor, and LTE radio simultaneously.

  • W200, W280, W280A compatibility: These three model numbers share the same battery bay dimensions, 3.85V nominal rail, and connector pinout. One cell covers all three without modification.
  • Bench tested on actual hardware: We fitted this cell to a W200 unit and confirmed the BMS accepted the new cell without error flags. Charge acceptance started immediately at 4.35V upper cutoff, and the fuel gauge IC registered charge state correctly after one full cycle.
  • Fuel gauge calibration after cell swap: After fitting the new cell, place the watch on its magnetic charger immediately and charge to 100% before first use. The fuel gauge IC on this platform cannot set a reliable reference point without a full charge cycle from near-zero following a cell swap.

Why the LTE radio shortens battery life more than Wi-Fi ever did

The W200 maintains a persistent LTE connection for standalone calls and notifications without a paired phone. That radio draws significantly more current than a BLE connection to a smartphone. On a 400mAh cell, continuous LTE standby is the single largest power consumer — more than the display or HR sensor. Disabling standalone LTE when a phone is nearby is the most effective way to extend discharge cycles on this cell.

Watch shows 0% and won't wake after battery swap

This is a fuel gauge IC reset, not a faulty cell. When the original battery is disconnected, the IC loses its reference charge state entirely and defaults to zero on restart. The watch may refuse to boot because firmware interprets 0% as a critically low state and blocks startup to protect the cell. Place it on the charger immediately after reassembly — once voltage climbs past approximately 3.7V, the IC re-references and the watch will boot normally.

Compatible Models

Watch Urbane 2nd Edition LTE W200 W280 W280A

Replaces Part Numbers

BL-S7

Technical Specifications

Voltage3.85V
Amp Hours400mAh
Capacity400mAh
Rate1.54Wh
Net Weight7.4g /0.26 oz
Gross Weight32g /1.13 oz
Approximate Weight32g /1.13 oz
Dimension 28.72 x 27.06 x 4.86mm

Product Highlights

  • Brand: LG
  • 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 LG Watch Urbane 2nd Edition is draining the new battery in a single day — is something wrong with the cell?

Nothing is wrong with the cell. The W200 runs LTE, continuous heart rate monitoring, and an AMOLED display from a 400mAh pack — that combination is a heavy load for a small cell. Check whether standalone LTE is active when your phone is nearby, and confirm always-on display mode is off. Turning off both cuts the two largest current draws and restores multi-day use from this cell.

The heart rate sensor is reading erratically and the battery seems to drain faster since I swapped the cell — what's happening?

During the first week after a cell swap, the HR sensor and its associated firmware can poll more aggressively while the fuel gauge IC recalibrates against the new cell's impedance profile. This is normal behaviour on the W200 platform and settles after three to five full charge cycles. If erratic readings persist beyond that point, check that the sensor window on the rear case is fully seated against your wrist — an air gap forces the sensor to increase power to compensate.

The watch isn't pairing with my phone after I replaced the battery — did I break something?

No — removing the battery terminates the active BLE session, and the W200 does not automatically re-establish a previously saved pairing after a full power loss. On your phone, open the LG Watch Urbane app or Android Wear/Wear OS, remove the watch from paired devices, then scan for it as a new device. Complete the pairing process fresh and the connection will restore normally.

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LG Watch Urbane 2nd Edition LTE Replacement Battery, 3.85V, 400mAh, Li-Polymer 1

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