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Honor 90 Pro HB506590EHW Replacement Battery 3.9V 4900mAh

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New arrival
From $38.99 USD $47.99
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Fits Honor 90 Pro smartphone, replaces OEM battery HB506590EHW.
3.9V, 4900mAh lithium-polymer cell delivers the voltage and capacity this device firmware expects.
Connector seats into the stock slot with flex cable alignment — no adapter needed.
We bench-cycled this cell under typical load; BMS initialized properly and fuel gauge tracked discharge accurately.
On first charge after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge IC recalibrate against the new cell's discharge 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

3.9V

Amp

4900mAh

Honor 90 Pro — 3.9V Li-Polymer Replacement Battery (HB506590EHW)

This is a 4900mAh 3.9V lithium-polymer cell for the Honor 90 Pro smartphone. It replaces the original HB506590EHW pack when the existing cell has degraded, lost capacity, or stopped holding a charge. Capacity is rated at 19.11Wh.

  • Honor 90 Pro fit: The 90 Pro uses a dedicated battery bay sized for an 88.80 × 64.30 × 4.90mm cell. This replacement matches that footprint exactly, and the connector and BMS handshake align with the charge IC on the 90 Pro's mainboard.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the 90 Pro platform. The BMS communicated correctly with the device's fuel gauge IC, and charge termination triggered at the correct cut-off voltage without error flags.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the Honor 90 Pro reports wrong battery percentage after a cell swap

The 90 Pro uses a coulomb counter that builds its discharge model against the original cell's impedance profile. When a new cell goes in, that model is stale — the IC is measuring against a curve that no longer matches. This causes the percentage display to read high or low by a significant margin, especially in the mid-range. One full uninterrupted discharge-to-low, then a full charge, forces the IC to rewrite its reference table. After that cycle, percentage accuracy normalises.

Sudden shutdown at 20–30% on the replacement cell

A new lithium-polymer cell at rest can hold a nominal voltage that satisfies the fuel gauge, but under the combined load of the modem, display, and CPU, the cell's internal resistance causes a voltage sag that drops below the BMS protection threshold instantly. The system cuts power before the percentage counter catches up — so the phone appears to shut off with charge remaining. This is most common on the first few cycles before the cell's internal resistance settles. Run two or three full cycles and the voltage sag narrows; shutdowns at 20–30% typically stop once the cell stabilises above 3.5V under load.

Compatible Models

90 Pro

Replaces Part Numbers

HB506590EHW

Technical Specifications

Voltage3.9V
Amp Hours4900mAh
Capacity4900mAh
Rate19.11Wh
Net Weight68g /2.40 oz
Gross Weight118g /4.16 oz
Approximate Weight118g /4.16 oz
Dimension 88.80 x 64.30 x 4.90mm

Product Highlights

  • Brand: Honor
  • 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

The Honor 90 Pro won't power on at all after the replacement battery sat in a drawer for a few months — is it dead?

A lithium-polymer cell in storage self-discharges slowly, and if it drops below roughly 2.5V per cell, the BMS latches into lockout mode to prevent damage. The phone won't respond to the power button because the BMS is blocking output entirely. Connect the phone to a low-current charger — a standard 5W wall adapter — and leave it for 20–30 minutes without pressing anything. Once the cell recovers above the BMS recovery threshold, the device will boot and normal charging resumes.

Fast charging stopped working after fitting this battery — the phone only trickle charges now

Honor's fast charge protocol involves a handshake between the charger, the USB-PD controller, and the battery BMS. On the first cycle with a new cell, the BMS sometimes rejects the elevated current request until it has completed one standard charge cycle. Use a basic 5W or 10W charger for the first full charge from low to 100%. On the second cycle, reconnect the fast charger — the BMS handshake typically completes correctly once the cell has one full cycle logged.

The battery percentage on the Honor 90 Pro jumps around erratically — it was at 45%, then jumped to 62% after a screen-on

This is the fuel gauge IC actively recalibrating against the new cell's discharge curve. The coulomb counter accumulated error because its reference model was built on the old cell's impedance data. Each charge-discharge cycle gives the IC new data points to correct against. Run two full uninterrupted cycles — discharge to the auto-shutoff point, then charge to 100% without interruption — and the readings will stabilise as the IC rewrites its internal model.

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