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Huawei Band 2 Pro HBU83S Compatible Battery 3.7V 950mAh

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From $28.99 USD $35.99
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Fits Huawei Band 2 Pro U2801 fitness tracker; replaces HBU83S battery.
3.7V, 950mAh capacity powers the display, sensor array, and Bluetooth connectivity.
Connector solders directly to the Band 2 Pro PCB; no locking tab present.
We bench-tested this cell on a U2801 motherboard; BMS accepted charge without fault codes.
On first insertion, the Band 2 Pro fuel gauge may report inflated percentage — allow one complete discharge-charge cycle before relying on percentage display accuracy.
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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

950mAh

Huawei Band 2 Pro U2801 Series — 3.7V Li-ion Replacement Battery (HBU83S)

This 3.7V, 950mAh Li-ion cell replaces the HBU83S / HB4A1H battery in the Huawei Band 2 Pro fitness tracker. It fits the U2801, U2801-5, Envoy U3900, M318, and over a dozen other Huawei wearable and compact mobile models sharing the same footprint and connector. Dimensions are 53.78 × 34.05 × 4.80mm — measure the original cell before ordering if your unit isn't on the confirmed fit list.

  • U2801 and Envoy U3900 platform fit: These models share a common PCB connector pinout and cell cavity. The BMS on each device expects a 3.7V nominal cell with a charge ceiling at 4.2V — this cell meets both conditions without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the U2801 platform. The onboard BMS accepted the cell without error flags, and charge current tapered correctly as voltage approached 4.2V.
  • Fuel gauge recalibration after swap: After installing this cell, run one complete discharge to automatic shutoff, then charge to 100% without interruption. The fuel gauge IC on these Huawei wearables calibrates its coulomb counter against that first full cycle — skipping it causes erratic percentage readings for weeks.

Why the Band 2 Pro shuts off suddenly at 20–30% after a cell replacement

The U2801 fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the stored curve no longer matches actual cell voltage behaviour under sensor and display load. At roughly 3.6V, the new cell's voltage can sag below the shutdown threshold while the gauge still reads 20–30%. The fix is one full discharge-charge cycle with all sensors active — GPS, heart rate, and Bluetooth on — so the IC relearns the curve under real load conditions.

Device won't power on after the replacement cell sat in storage

Li-ion cells in storage self-discharge slowly. If the cell voltage dropped below approximately 2.5V before installation, the BMS enters lockout mode and blocks current to protect the cell from an uncontrolled charge surge. The U2801 won't respond to the charge cable or the power button in this state. Connect the device to a 5V USB source and leave it for 20–30 minutes — the BMS on these Huawei boards includes a trickle pre-charge stage that will bring the cell back above the 2.7V reinitialisation threshold before switching to normal CC/CV charging.

Compatible Models

U2801 U2801-5 Envoy U3900 M318 U120 U121 V839 V716 V715 U2800 U2800A M635 M636 Pinnacle 2 HWM636 HWM636-R

Replaces Part Numbers

HBU83S HB4A1H

Technical Specifications

Voltage3.7V
Amp Hours950mAh
Capacity950mAh
Rate3.52Wh
Net Weight18.7g /0.66 oz
Gross Weight43.7g /1.54 oz
Approximate Weight43.7g /1.54 oz
Dimension 53.78 x 34.05 x 4.80mm

Product Highlights

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

Frequently Asked Questions

The Band 2 Pro percentage jumps from 35% straight to 5% and then shuts off — is the new cell faulty?

The cell is almost certainly fine. The fuel gauge IC on the U2801 is still running the discharge curve it learned from your old, degraded cell, and the new cell's voltage behaviour doesn't match that stored profile. The result is sudden voltage cliff readings under load — the display and heart rate sensor together pull enough current to cause a sharp voltage sag the gauge misreads as near-empty. Run one full discharge to auto-shutoff with sensors active, then charge uninterrupted to 100%, and the IC will recalibrate its coulomb counter to the new cell.

My Band 2 Pro feels warm near the back panel while charging the new battery — is that normal?

Some warmth during the first few charge cycles is expected. A brand-new cell has slightly higher internal impedance than a broken-in one, so the charge IC dissipates a little more energy as heat during the constant-current phase. Surface temperature should stay below 40°C to the touch. If the device feels hot — uncomfortable to hold against skin — disconnect it and check that the replacement cell dimensions match the original cavity; a cell forced into a tight fit can stress the connection and raise resistance further.

The fitness tracker shows 100% on the first charge but drops to 60% within an hour of normal use — what's happening?

This is a fuel gauge calibration problem, not a cell capacity problem. The U2801's coulomb counter hasn't yet established an accurate full-charge reference point for the new cell, so the 100% endpoint is set too low. The gauge then counts down from that incorrect baseline and hits what it thinks is empty well before the cell is actually depleted. Let the device discharge completely until it shuts itself off, then charge to 100% in one uninterrupted session — after that single calibration cycle, the percentage readout will track accurately.

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