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Huawei P40 Pro Replacement Battery HB536378EEW 3.85V 3750mAh

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Fits Huawei P40 Pro with OEM part number HB536378EEW; compatible with ELS-N09 and ELS-NX9 variants.
This 3.85V 3750mAh Li-Polymer cell matches the original discharge curve and fuel gauge IC calibration window for the P40 Pro.
Connector seats flush into the battery slot with no locking tab; orientation marked on both cell and housing.
We ran full discharge cycles on the ELS-N09 platform; the BMS accepted the new cell handshake without fault codes or voltage sag.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against the new cell curve.
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

3.85V

Amp

3750mAh

Huawei P40 Pro — 3.85V Li-Polymer Replacement Battery (HB536378EEW)

This 3.85V, 3750mAh Li-Polymer cell replaces the original HB536378EEW battery in the Huawei P40 Pro (ELS-N09, ELS-NX9). It restores charge capacity on phones where the original cell has degraded through extended daily use. Voltage and capacity match OEM specifications exactly.

  • P40 Pro model variants (ELS-N09, ELS-NX9): Both regional variants share the same battery connector, BMS handshake protocol, and voltage rail. One cell fits both boards without modification.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a P40 Pro board. The BMS accepted the cell without fault codes, and the charge IC stepped through standard CC/CV stages as expected.
  • Fuel gauge recalibration on first use: After installation, disable fast charging and complete one full discharge-charge cycle at standard speed. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state — preventing erratic percentage readings from the first charge onward.

Sudden shutdown at 20–30% on the P40 Pro after a cell swap

This happens because the fuel gauge IC is still running the discharge curve it mapped for the original, degraded cell. When the new cell hits a voltage point the old curve didn't predict accurately, the IC interprets it as a low-voltage emergency and cuts power. It is not a fault with the replacement cell. One complete discharge-charge cycle at standard charge speed resets the coulomb counter and recalibrates the IC against the new cell's actual curve. After that cycle, shutdowns at falsely-reported percentages stop.

USB-PD fast charge not accepted on the first cycle after replacement

On the first cycle after installation, the P40 Pro's charge IC sometimes refuses to enter the fast-charge handshake because it has no stored data on the new cell's impedance profile. The charger negotiates, the IC declines, and the phone falls back to standard 5V charging. This is not a compatibility fault — it resolves after the first full standard charge cycle. Once the IC has logged baseline impedance data, plug in a Huawei SuperCharge adapter and the fast-charge protocol will negotiate correctly from 5V up to the target voltage.

Compatible Models

P40 Pro ELS-N09 ELS-NX9

Replaces Part Numbers

HB536378EEW

Technical Specifications

Voltage3.85V
Amp Hours3750mAh
Capacity3750mAh
Rate14.44Wh
Net Weight59g /2.08 oz
Gross Weight109g /3.84 oz
Approximate Weight109g /3.84 oz
Dimension 75.70 x 61.80 x 5.50mm

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 P40 Pro won't turn on at all after the replacement battery sat in a drawer for a few months — is it dead?

The BMS locks out the cell when voltage drops below roughly 2.5V during storage, which is a hard protection state, not a dead battery. Connect the phone to a genuine Huawei charger and leave it for 20–30 minutes without pressing the power button — the charge IC will trickle current into the cell to recover it past the BMS lockout threshold. Once voltage climbs above 3.0V, the phone will boot normally.

The battery percentage jumps around erratically — it reads 45%, then skips to 61%, then drops back — what's causing this?

The fuel gauge IC on the P40 Pro's board is still running a model calibrated to the old cell's charge curve. The coulomb counter loses tracking when the discharge behaviour of the new cell doesn't match the stored profile, so it snaps to the nearest curve reference point instead of interpolating smoothly. Complete one full uninterrupted discharge down to automatic shutdown, then charge to 100% at standard speed with fast charging disabled. That single cycle gives the IC enough data to rebuild an accurate curve for the new cell.

The phone gets noticeably warm near the battery area during the first few charges — should I be concerned?

A new Li-Polymer cell has higher internal impedance than a cell that has been through several charge cycles, so the charge IC dissipates more energy as heat during the initial CC phase. This is normal on the first two or three charges and not a sign of a fault. The warmth should reduce noticeably by the third full charge as impedance settles. If the phone still runs hot to the touch after five full cycles, check that the charge IC is not stuck in fast-charge mode — disable SuperCharge in the battery settings and run one standard-speed cycle.

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