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Huawei Mate 8 HB396693ECW Replacement Battery 3.8V 4000mAh

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From $25.99 USD $31.99
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Fits Huawei Mate 8 and replaces OEM battery HB396693ECW.
This 3.8V lithium-polymer cell holds 4000mAh capacity, restoring full-charge cycles to the Mate 8 after degradation.
Connector integrates directly into the Mate 8 battery slot with standard flex-tab orientation and spring-loaded retention.
We bench-tested this pack on a Mate 8 motherboard; the BMS accepted the cell on first insertion with no fault codes during charge ramp.
On first use after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge IC recalibrate against the new cell discharge curve.
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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

4000mAh

Huawei Mate 8 / Ascend Mate 8 — 3.8V Li-Polymer Replacement Battery (HB396693ECW)

This is a 3.8V, 4000mAh Li-Polymer replacement battery for the Huawei Mate 8 and Ascend Mate 8 series, including the Ascend Mate 8 Dual SIM and M200-UL00 variants. It replaces the original HB396693ECW cell when the factory battery degrades and can no longer hold a usable charge. Dimensions are 91.38 × 66.08 × 3.85 mm — confirm your original cell matches before installation.

  • Mate 8 series compatibility: The Mate 8, Ascend Mate 8, Dual SIM, and M200-UL00 all share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell fits the full line without modification.
  • Bench tested on actual hardware: We ran this cell on a Mate 8 unit and confirmed the BMS negotiated correctly with the charge IC — no charge rejection, no fault flags in the battery status register.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Mate 8 after a cell swap

This happens because the fuel gauge IC is still using the old cell's voltage-to-capacity curve. When the new cell's voltage drops faster than the IC expects under modem or screen load, the phone hits the hardware cutoff before the percentage display reaches zero. The IC reports 25% remaining, but the actual cell voltage has already fallen below the safe floor. One full discharge cycle — draining to automatic shutdown, then charging uninterrupted to 100% — rewrites the IC's learned curve against the new cell and clears this behaviour.

Huawei fast charging not working on the first cycle after replacement

Huawei's proprietary charge protocol requires a handshake between the charger and the battery BMS before high-current charging is permitted. On a freshly installed cell, the BMS may not complete this handshake on the first cycle and defaults to standard 5V/1A input instead. This is not a fault — it is a one-cycle initialisation behaviour. Charge fully once using the original Huawei wall adapter, unplug, then reconnect; fast charge typically resumes on the second cycle.

Compatible Models

Mate 8 Ascend Mate 8 Ascend Mate 8 Dual SIM M200-UL00 Mate 8 Dual SIM TD-LTE 32GB NXT-AL10 NXT-L29 Mate 8 Dual SIM TD-LTE 64GB NXT-L09 NXT-TL00 NXT-CL00 NXT-DL00

Replaces Part Numbers

HB396693ECW

Technical Specifications

Voltage3.8V
Amp Hours4000mAh
Capacity4000mAh
Rate15.2Wh
Net Weight56g /1.98 oz
Gross Weight91g /3.21 oz
Approximate Weight91g /3.21 oz
Dimension 91.38 x 66.08 x 3.85 mm

Product Highlights

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

Frequently Asked Questions

My Mate 8 turns off at around 25% after I swapped the battery — what's causing it?

The fuel gauge IC is still calibrated to your old, degraded cell and mispredicts when the new cell will hit the voltage cutoff. Under high-load moments — LTE data, GPS, screen at full brightness — the new cell's voltage drops sharply, and the phone shuts down before the percentage display catches up. Run one full uninterrupted discharge to automatic shutdown, then charge straight to 100% without unplugging. After that cycle, the coulomb counter recalibrates against the new cell's actual curve and the early shutdowns stop.

The phone isn't powering on at all after the battery sat in a drawer for months before I installed it — is it dead?

If a Li-Polymer cell discharges below roughly 2.5V during long storage, the BMS locks out to prevent further drain and the phone will not respond to the power button or a charger. Connect the original Huawei charger and leave it plugged in for 20–30 minutes without pressing anything — the charge IC will trickle current into the cell at a safe rate until voltage climbs back above the BMS re-enable threshold. Once the screen shows a charge indicator, proceed with a normal charge cycle to 100%.

The battery percentage jumps around erratically — showing 60%, then suddenly 80%, then dropping to 40% — after I replaced the cell. Is this a faulty battery?

This is the fuel gauge IC recalibrating after a new cell is installed — not a defective battery. The IC's internal model of cell capacity was built around the old cell's impedance and discharge characteristics, and those numbers no longer match. The jumps narrow and stabilise after two to three full discharge-charge cycles as the coulomb counter accumulates enough data to rebuild an accurate state-of-charge map. Complete two consecutive full cycles — drain to auto-shutdown, charge uninterrupted to 100% each time — and monitor percentage behaviour after the third full charge.

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