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Huawei Watch 1 Compatible Battery HB442528EBC 3.8V

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From $38.99 USD $47.99
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Fits Huawei Watch 1 smartwatch; replaces OEM battery HB442528EBC.
This 3.8V, 270mAh lithium-polymer cell restores multi-day runtime to the wearable after capacity degradation.
Connector is a two-pin JST-ZH header soldered directly to the motherboard; polarity marked on the pad.
We bench-tested the cell with the Watch 1 charging circuit; the fuel gauge IC accepted the new BMS on first insertion without fault codes.
After fitting this cell, place the watch on its magnetic charger immediately and charge to 100% before first use — the fuel gauge 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.

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

3.8V

Amp

270mAh

Huawei Watch 1 — 3.8V Li-Polymer Replacement Battery (HB442528EBC)

This 3.8V, 270mAh Li-Polymer cell is a direct cell replacement for the Huawei Watch 1 smartwatch. It matches the OEM part number HB442528EBC and fits the original battery bay at 27.50 x 24.00 x 3.50mm. If your Watch 1 no longer holds charge through a day of normal use, this cell addresses the degraded capacity in the original.

  • Huawei Watch 1 platform fit: The Watch 1 runs a single-cell 3.8V Li-Polymer architecture. This cell matches that voltage rail and the flex connector orientation the watch's charging and power management IC expects. No adapter or modification is needed.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Watch 1 platform. The BMS accepted the new cell without flagging a fault, and the fuel gauge IC tracked state-of-charge correctly after a full conditioning cycle from near-zero.
  • Post-swap charge requirement: After fitting this cell, place the watch on its magnetic charger immediately and run it to 100% before first use. The fuel gauge IC on the Watch 1 loses its reference point when the cell is swapped. Without a full charge cycle from near-zero, the percentage reading will be inaccurate from the first use.

Why the Watch 1 reports wrong battery percentage after a cell swap

The Watch 1 uses a coulomb-counting fuel gauge IC that tracks charge in and out of the cell over time. When the original cell is removed, the IC loses its accumulated reference data. It cannot accurately estimate capacity on a new cell without recalibrating. One full charge from near-zero to 100% gives the IC the reference point it needs to report correctly going forward.

Watch not pairing with phone after battery replacement

Removing the battery kills the BLE stack mid-session. The phone retains the old pairing record, but the watch boots with no active session — so the two devices see each other as unrecognised. The fix is to remove the watch from your phone's Bluetooth settings entirely, then re-initiate pairing through the Huawei Health app from scratch. Do not just tap "connect" on an existing entry — delete it first, then pair fresh.

Compatible Models

Watch 1

Replaces Part Numbers

HB442528EBC

Technical Specifications

Voltage3.8V
Amp Hours270mAh
Capacity270mAh
Rate1.03Wh
Net Weight5g /0.18 oz
Gross Weight30g /1.06 oz
Approximate Weight30g /1.06 oz
Dimension 27.50 x 24.00 x 3.50mm

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 Huawei Watch 1 shows 0% and won't turn on right after I put the new battery in — did I get a dead cell?

Almost certainly not a dead cell. The fuel gauge IC lost its charge reference when the original cell was removed, so it boots with no valid state-of-charge data and displays 0% or refuses to start. Put the watch straight on its magnetic charger and leave it until it reads 100% — do not interrupt the charge. After that full cycle from near-zero, the IC recalibrates and the watch will power on and report correctly.

New battery fitted, but the Watch 1 is draining in under a day — the old one used to last two days even when it was dying.

Always-on display combined with continuous heart rate monitoring is the most common cause of accelerated drain on a fresh cell. The HR sensor runs at higher polling frequency when the watch cannot establish a stable reading — this happens more often in the first few days on a new cell as the sensor adjusts to a slightly different internal impedance profile. Check your display settings and set HR monitoring to auto rather than continuous. If drain persists beyond a week, check that background app sync is not set to push mode in Huawei Health.

The magnetic charger isn't registering on the watch after I reassembled it — no charging icon appears.

This is an alignment issue, not a faulty charger or cell. The magnetic pogo-pin contacts on the Watch 1 require the charger to seat flush against the rear of the case. If the back cover shifted even slightly during reassembly, the pins miss the charge pads. Press the charger firmly against the rear until you feel the magnets pull it flat, then check for the charging icon. If it still does not register, open the watch and confirm the back cover is fully seated with no flex on the charge pad side.

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