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HP ZBook 15 G5 Replacement Battery 15.4V 5600mAh 4ME79AA

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From $129.99 USD $155.99
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Fits HP ZBook 15 G5 mobile workstation, replaces OEM part 4ME79AA.
Voltage measures 15.4V at 5600mAh capacity, delivering 86.24Wh to sustain engineering workloads.
Connector type matches the original ZBook 15 G5 slot; locking tab secures without force.
We bench-tested against the OEM cell under sustained CPU and GPU load; BMS engaged protection at proper thresholds.
After installation, run one full discharge to hibernation followed by uninterrupted charge to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after cell swaps.
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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

15.4V

Amp

5600mAh

HP ZBook 15 G5 — 15.4V Li-ion Replacement Battery (VX04XL)

This is a 15.4V, 5600mAh (86.24Wh) lithium-ion replacement battery for the HP ZBook 15 G5 mobile workstation. It fits the ZBook 15 G5 series, including models 2YX00AV, 3AX02AV, 3AX03AV, and over 24 additional variants. The OEM part numbers covered include VX04XL, HSN-Q13C, HSTNN-IB8F, L05766-855, and 4ME79AA.

  • ZBook 15 G5 platform fit: All ZBook 15 G5 variants share the same 15.4V four-cell battery architecture, connector pinout, and BMS handshake protocol. The SMBus communication lines are identical across the G5 series, so the BIOS recognises this cell without flashing or modification.
  • Bench tested on actual hardware: We ran this battery on a ZBook 15 G5 under sustained CPU and GPU load. The BMS held the voltage rail above 14.8V throughout the discharge curve and tripped the low-voltage cutoff at the correct threshold without any spurious shutdowns.
  • Post-install calibration cycle: After fitting this battery, run the laptop down to hibernate cutoff under real workload — not just screen-on idle — then charge uninterrupted to 100%. This forces the ZBook's EC firmware to relearn the cell's actual capacity curve and clears the inaccurate health warning that appears after every cell replacement.

Why the ZBook 15 G5 shuts down at 20–30% remaining after a battery swap

The ZBook 15 G5 uses an embedded controller that maps voltage thresholds against the old cell's discharge curve stored in EEPROM. A new cell with a different internal resistance profile reaches the EC's learned shutdown voltage earlier than the gauge expects. Under full CPU plus dedicated GPU load, the voltage sags faster than the OS fuel gauge can track. The fix is a full battery learn cycle: discharge to hibernate under load, then charge to 100% without interruption — after two cycles the EC recalibrates its threshold mapping to the new cell.

BIOS reporting battery health as "Poor" or "Unknown" immediately after installation

The HP BIOS reads health data from the battery's EEPROM at POST. A replacement cell ships with EEPROM counters at zero, which the firmware interprets as a degraded or unrecognised unit. This is a firmware read artefact — not a fault with the cell itself. Boot into HP PC Hardware Diagnostics or the BIOS battery check utility, run the battery learn cycle once, and the health status updates to reflect the actual cell state. After calibration, the BIOS should report voltage at or above 15.2V on a full charge.

Compatible Models

Zbook 15 G5 ZBook 15 G5 2YX00AV ZBook 15 G5 3AX02AV ZBook 15 G5 3AX03AV ZBook 15 G5 3AX04AV ZBook 15 G5 3AX05AV ZBook 15 G5 3AX06AV ZBook 15 G5 3AX07AV ZBook 15 G5 3AX08AV ZBook 15 G5 3AX09AV ZBook 15 G5 3AX10AV ZBook 15 G5 3AX11AV ZBook 15 G5 3AX12AV ZBook 15 G5 3AX13AV ZBook 15 G5 3AX14AV ZBook 15 G5 3AX15AV ZBook 15 G5 5KY98AV ZBook 15 G5 5KY99AV ZBook 15 G5 5KZ00AV ZBook 15 G5 2YW99AV ZBook 15 G5 2ZC40EA ZBook 15 G5 2ZC41EA ZBook 15 G5 2ZC42EA ZBook 15 G5 2ZC54EA ZBook 15 G5 2ZC64EA ZBook 15 G5 2ZC67EA ZBook 15 G5 4QH14EA ZBook 15 G5 4QH15EA

Replaces Part Numbers

4ME79AA HSN-Q13C HSNQ13C HSTNN-IB8F HSTNNIB8F L05766-855 L05766855 L06302-1C1 L063021C1 VX04090XL VX04XL

Technical Specifications

Voltage15.4V
Amp Hours5600mAh
Capacity5600mAh
Rate86.24Wh
Net Weight371.4g /13.10 oz
Gross Weight631.4g /22.27 oz
Approximate Weight631.4g /22.27 oz
Dimension 257.96 x 71.42 x 13.16mm

Product Highlights

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

Frequently Asked Questions

The ZBook 15 G5 shuts itself off without warning even though Windows still shows 25% charge — is the new battery faulty?

This is a voltage cliff, not a faulty cell. Under full CPU and GPU draw, the new cell's voltage drops faster than the fuel gauge IC can update its display, and the EC trips the hardware cutoff before the OS percentage reaches zero. It is most common in the first three charge cycles before the embedded controller has calibrated against the new cell's discharge curve. Run one full discharge to hibernate under real workload, charge uninterrupted to 100%, and repeat once more — the shutdowns stop once the EC maps the new threshold correctly.

Windows Battery Report is showing the wrong Wh rating — it says 84Wh but the cell is rated 86.24Wh — is something wrong?

Nothing is wrong with the battery. The Wh figure Windows reads comes from the EEPROM design-capacity register on the cell, which stores a rounded factory value that may differ slightly from the chemistry-measured actual capacity. The ZBook 15 G5's EC also applies its own firmware rounding when reporting to WMI. The cell delivers its full rated capacity regardless of what the report displays — verify this by checking the full-charge capacity field in the Battery Report after two complete calibration cycles, where the reported value should align closer to the actual 86.24Wh.

The ZBook 15 G5 fuel gauge jumps erratically — shows 60%, then 45%, then 70% within minutes of unplugging

The fuel gauge IC on the ZBook 15 G5 uses a learned model of the cell's impedance to estimate state-of-charge. A new cell has no learned data, so the IC interpolates poorly and the percentage reading swings. This resolves through calibration, not hardware replacement. Discharge the laptop fully to hibernate cutoff under consistent load — avoid putting it to sleep mid-cycle — then charge to 100% without interruption. After two full cycles the gauge IC stabilises and the jumps stop.

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