HP Envy X360 M6 Compatible Battery 15.4V 3400mAh MB04XL
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HP Envy X360 M6 Compatible Battery 15.4V 3400mAh MB04XL - is backordered and will ship as soon as it is back in stock.
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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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Disclaimer
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HP Envy X360 M6 Compatible Battery 15.4V 3400mAh MB04XL - is backordered and will ship as soon as it is back in stock.
Voltage
15.4V
Amp
3400mAh
HP Envy X360 M6 — 15.4V Li-ion Replacement Battery (MB04XL)
This is a 15.4V lithium-ion battery rated at 3400mAh (52.36Wh), built to fit the HP Envy X360 M6 convertible laptop. It covers models including the M6-AQ105DX, M6-AQ003DX, and M6-AQ005DX, along with the broader M6 series. Cross-reference OEM part numbers MB04XL, HSTNN-UB6X, or TPN-W119/W120 before ordering.
- Envy X360 M6 platform fit: The M6 series runs a shared 15.4V four-cell battery rail across its convertible chassis. All covered models use the same connector pinout, BMS handshake protocol, and EEPROM charge data structure — which is why one part number covers the full lineup.
- Bench tested on actual hardware: We cycled this cell on an M6 chassis and verified the BMS initialised cleanly, the EEPROM flagged no fault codes, and charge current stepped down correctly at the 80% and 100% thresholds. No false over-temperature trips occurred during the test.
- Post-install calibration on the Envy X360 M6: After fitting, run the laptop down to hibernate-cutoff on battery alone — no AC adapter — then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell's actual capacity curve and clears the inaccurate health warning the BIOS throws after any cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The HP Envy X360 BIOS reads health status from EEPROM data stored during the previous cell's charge cycles. When a new cell goes in, that EEPROM register hasn't been written yet, so the BIOS flags the battery as degraded or unknown — even though the cell is fresh. This is not a fault with the replacement; it's a data gap. Running one full discharge-to-hibernate then an uninterrupted charge to 100% lets the battery controller rewrite the EEPROM registers with current cell data, and the health warning clears on the next boot.
Envy X360 M6 shutting down abruptly at 20–30% charge shown
This usually points to a voltage cliff — the cell drops below the BMS cutoff threshold under combined CPU and display load before the fuel gauge reaches zero. On a worn original battery, the internal resistance has risen enough that load spikes pull the cell voltage below roughly 12.5V momentarily, triggering an emergency shutdown. The OS-reported percentage is based on the fuel gauge estimate, not real-time cell voltage, so the two figures diverge under load. Run a full calibration cycle first — discharge to hibernate-cutoff, charge to 100% uninterrupted — and retest. If the shutdown persists on a brand-new cell, check for a BIOS update from HP that recalibrates the low-voltage threshold for the M6 platform.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 HP Envy X360 M6 system info shows the wrong Wh rating after I installed the new battery — is the cell actually a different capacity?
The Wh figure displayed in Windows or BIOS is pulled from the EEPROM on the new cell, which stores the rated chemistry spec rather than a live measured value. Until the fuel gauge IC has run at least one or two full charge-discharge cycles against the actual cell, the reported Wh can differ from the label spec. Run two complete discharge-to-hibernate and charge-to-100% cycles, and the displayed figure will settle to match the cell's real capacity data. If it still reads incorrectly after two cycles, cross-check the part number against MB04XL or HSTNN-UB6X to confirm the correct cell is installed.
My HP Envy X360 M6 fuel gauge is jumping around — showing 60%, then suddenly 45%, then back up — after the battery swap. What's happening?
The fuel gauge IC on the M6 uses charge history from the old cell to estimate state-of-charge on the new one, and that history is now wrong. Until it collects fresh coulomb-counting data from the new cell, the percentage readout will be erratic and can swing 10–20% between readings. Two full calibration cycles — discharge to hibernate-cutoff on battery alone, then charge uninterrupted to 100% each time — give the gauge IC enough real data to lock in accurate readings. After the second cycle, the readout should track smoothly within a few percentage points of actual.
The HP Envy X360 M6 stops charging at 80% and won't go higher — is the new battery faulty?
This is almost always the HP Battery Care function or Adaptive Battery Charging setting active in BIOS or HP Support Assistant, not a fault with the cell itself. HP ships several M6 BIOS versions with a charge-limit mode that caps charging at 80% to reduce long-term cell stress when the laptop sits on AC power most of the time. Go into BIOS setup (F10 at boot), locate the
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