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Huawei Band 3 Pro Compatible Battery HB351329ECW 3.82V 100mAh

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From $23.99 USD $29.99
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Fits Huawei Band 3 Pro smartwatch and replaces OEM battery HB351329ECW directly.
This 3.82V, 100mAh Li-Polymer cell restores multi-day runtime to your fitness tracker after original degradation.
Connector is a two-pin flex cable; orientation matters — align the connector slot before seating fully.
We bench tested this cell on the Band 3 Pro fuel gauge IC and confirmed clean handshake on insertion.
After fitting, place the watch on its charger immediately and charge to 100% before first use — the fuel gauge IC cannot calibrate without a full charge 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.

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

3.82V

Amp

100mAh

Huawei Band 3 Pro — 3.82V Li-Polymer Replacement Battery (HB351329ECW)

This is a 3.82V, 100mAh Li-Polymer cell replacing part number HB351329ECW in the Huawei Band 3 Pro fitness tracker. The Band 3 Pro is a slim wrist-worn device with continuous heart rate monitoring, GPS, and sleep tracking. Dimensions are 27.40 × 12.00 × 3.20mm — a tight fit, so exact sizing matters.

  • Band 3 Pro platform fit: The Band 3 Pro runs a single-cell Li-Polymer architecture at 3.82V nominal. The BMS on this platform reads cell impedance at startup, so the replacement cell must match the original voltage rating exactly — any deviation triggers a low-battery fault before the fuel gauge can calibrate.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Band 3 Pro platform. The BMS accepted the cell without fault flags, and the fuel gauge stepped through charge states normally from near-zero to full.
  • Post-swap charging on the Band 3 Pro: After fitting this cell, place the watch on its magnetic charger immediately and charge to 100% before use. The Band 3 Pro fuel gauge IC loses its reference point when the original cell is removed. Without a full charge cycle from near-zero, the gauge cannot recalibrate and will report inaccurate percentages.

Why the Band 3 Pro fuel gauge reads incorrectly after a cell swap

The Band 3 Pro uses a coulomb-counting fuel gauge IC that tracks charge by measuring current flow over time. When the original cell is disconnected, the IC loses its accumulated reference data — it has no baseline to work from. The new cell arrives at a partial state of charge, which the gauge cannot interpret without a calibration cycle. One full charge from near-zero resets the counter and restores accurate percentage readings.

Watch not pairing with the Huawei Health app after battery replacement

Removing power during a battery swap terminates any active BLE session between the Band 3 Pro and the paired phone. The watch generates a new session token on next boot, which the phone's Bluetooth stack does not recognise automatically. Open the Huawei Health app, go to device settings, remove the Band 3 Pro from paired devices, then re-pair from scratch. The watch must show a stable charge above 10% before pairing will complete reliably.

Compatible Models

Band 3 Pro

Replaces Part Numbers

HB351329ECW

Technical Specifications

Voltage3.82V
Amp Hours100mAh
Capacity100mAh
Rate0.38Wh
Net Weight2.2g /0.08 oz
Gross Weight27.2g /0.96 oz
Approximate Weight27.2g /0.96 oz
Dimension 27.40 x 12.00 x 3.20mm

Product Highlights

  • Brand: Huawei
  • 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 Band 3 Pro shows 0% and won't turn on right after I put in the new battery — is the cell dead?

The cell is almost certainly fine. The Band 3 Pro fuel gauge IC loses its charge reference the moment the old cell is disconnected, so it has no idea what state the new cell is in and defaults to 0%. Place the watch on its magnetic charger immediately and leave it until the display confirms 100%. That single full charge cycle resets the gauge and the watch will power on normally.

Band 3 Pro draining the new battery in one day — used to last several days on the original

Always-on heart rate monitoring combined with GPS logging draws significantly more current than basic step counting. Check the Huawei Health app and confirm continuous heart rate monitoring is not set to every minute — switching to smart detection cuts sensor draw considerably. Also confirm GPS is not logging in the background after a workout session ends. If drain persists after the first three to four charge cycles, the fuel gauge is still calibrating to the new cell's impedance and readings will stabilise.

Magnetic charger not registering on the Band 3 Pro after I reassembled it

The charging contacts on the Band 3 Pro back panel shift easily if the watch body is not fully reseated after a battery swap. Remove the watch from the charger, press the back panel firmly until you feel it click flat all the way around, then re-place it on the charger. Clean the gold contacts on both the watch and the charger puck with a dry cloth — even skin oils raise contact resistance enough to prevent a charge handshake. The charger LED should illuminate within 10 seconds of correct contact.

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