HP ProBook 440 10.8V Replacement Battery FP06XL 4400mAh
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HP ProBook 440 10.8V Replacement Battery FP06XL 4400mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
HP ProBook 440 10.8V Replacement Battery FP06XL 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
HP ProBook 440 Series — 10.8V Li-ion Replacement Battery (3ICR19/65-3)
This is a 10.8V, 4400mAh (47.52Wh) Li-ion replacement battery for the HP ProBook 440, 440 G0, 440 G1, and 445 series notebooks. It fits the six-cell bay used across the ProBook 440 line and replaces OEM part numbers including FP06, HSTNN-IB4J, 707616-141, and 708457-001 among others. The cell matches the original voltage rail and connector pinout used on these business-class notebooks.
- ProBook 440 and 445 series fit: The 440, 440 G0, 440 G1, and 445 share the same battery bay geometry, six-pin SMBus connector, and 10.8V nominal voltage rail. That is why one cell covers all four platforms — the BMS handshake protocol and charge termination logic are identical across these generations.
- Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS communication cycles on a ProBook 440 G1. The SMBus dialogue completed correctly, charge termination triggered at the expected voltage, and no fault codes were logged in the battery status register.
- First cycle after install: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity — skipping this step leaves the fuel gauge IC working off stale EEPROM data from the old battery.
BIOS reporting battery health as poor immediately after replacement
The ProBook 440 BIOS reads battery health from EEPROM data stored in the battery's fuel gauge IC. When you swap cells, the BIOS compares the new cell's reported state against the old cell's wear history still cached in firmware — the mismatch triggers a false health warning. This is not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by an uninterrupted full charge allows the fuel gauge IC to recalibrate against real cell data, after which the BIOS health flag clears on next boot. If the warning persists past two full cycles, check the battery status in HP Support Assistant against the actual voltage reading — a healthy cell at full charge should read 12.4–12.6V at the terminals.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load before the OS fuel gauge expects it to. The fuel gauge IC is still using a capacity map built from the degraded original battery, so it reports 25% remaining while the actual cell voltage has already hit the hard cutoff floor. It is a calibration gap, not a faulty replacement. Run two full discharge-to-hibernate and full recharge cycles — the fuel gauge IC will remap its capacity curve against the new cell, and the shutdowns will stop. After calibration, the BMS hard cutoff should not trigger until the cell drops below 9.0V under load.
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
HP Support Assistant is showing the wrong Wh rating for this replacement — it says 41Wh but the battery is rated 47.52Wh. Is the cell defective?
The Wh figure shown in HP Support Assistant is pulled from the EEPROM embedded in the battery's fuel gauge IC, which stores the manufacturer's rated design capacity. Different cell batches and OEM part variants for this platform carry slightly different EEPROM values, so the reported Wh can differ from the label spec. This is a data mismatch, not a capacity defect — the actual energy delivered to the system is determined by real cell chemistry, not the EEPROM figure. Run two full calibration cycles and then compare actual discharge time rather than relying on the Wh field in system info.
The OS fuel gauge is jumping wildly — showing 80%, then 45%, then 90% within minutes of unplugging. What's happening?
The fuel gauge IC inside the new cell needs several full charge and discharge cycles before it can accurately track state-of-charge against the new cell's actual voltage curve. Until those cycles are complete, the IC is extrapolating from a generic capacity model, which causes the erratic percentage jumps you are seeing. This is normal behaviour for the first two to three cycles after a cell swap on the ProBook 440. Run two full discharges to hibernate cutoff followed by uninterrupted charges to 100% — the readings will stabilise once the IC has mapped the new cell's voltage-to-capacity profile.
The new battery stops charging at 80% and will not go higher, even after hours on AC power. Is the charger the problem?
This is almost always the BIOS-controlled charge limit feature, not a charger fault and not a problem with the replacement cell. HP ProBook firmware includes a battery care setting that caps charge at 80% to reduce cell stress during long AC-connected use — it is enabled by default on some BIOS versions. Go to BIOS Setup (F10 at boot), navigate to the Power Management or Battery settings section, and disable the charge limit or set it to 100%. After saving
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