HP RE03XL ProBook 450 G6 Replacement Battery 11.55V 3800mAh
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HP RE03XL ProBook 450 G6 Replacement Battery 11.55V 3800mAh - 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.
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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 RE03XL ProBook 450 G6 Replacement Battery 11.55V 3800mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
3800mAh
HP ProBook 450 G6 — 11.55V Li-Polymer Replacement Battery (RE03XL)
This is an 11.55V, 3800mAh (43.89Wh) Li-Polymer replacement battery for the HP ProBook 450 G6, 440 G6, 430 G6, and 445 G6. It uses OEM part number RE03XL and cross-references HSTNN-DB9A, L32407-2B1, and L32656-005 among others. If the original cell is swollen, dead, or no longer holding charge, this is the direct cell swap.
- ProBook 430 / 440 / 445 / 450 G6 platform fit: These four models share the same 11.55V three-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol — one cell covers all four. The BIOS on each expects the same EEPROM battery ID, so the RE03XL registers correctly without firmware flags on any of them.
- Bench tested on actual hardware: We ran this cell in a ProBook 450 G6 and confirmed the BMS handshake completed on first insertion, the BIOS accepted the cell as a known battery, and charge current stepped correctly from bulk to taper phase without interruption or error codes.
- BIOS learn cycle after swap: After installing, discharge the laptop fully until it hibernates on its own, then charge uninterrupted to 100% without waking it. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first few boots after any cell replacement.
Why the ProBook 450 G6 reports poor battery health after a cell swap
The HP BIOS stores charge history and wear data in the old cell's EEPROM. When a new cell goes in, that history resets to zero, and the BIOS interprets the mismatch as a degraded or unknown battery. The health warning is a firmware artefact — not a sign the replacement cell is faulty. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% lets the BIOS rebuild its learn table against the new cell and clears the warning.
ProBook 450 G6 shutting down at 20–30% charge remaining
This happens when the fuel gauge IC inside the laptop is still calibrated to the old cell's voltage curve. The IC reads 20–25% but the actual cell voltage has already hit the low-cutoff threshold under full CPU and display load — so the system cuts out without warning. The fix is a calibration cycle: let the laptop run unplugged on battery-only until it hibernates at low battery, then charge to 100% without interruption. After two to three of these cycles, the fuel gauge re-anchors to the new cell and the shutdowns stop.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: HP
- 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
HP Battery Check keeps flagging the new RE03XL as "Consider replacing your battery" — is the cell actually bad?
It is not a bad cell. The HP BIOS pulls wear history from the old cell's EEPROM, and when that data disappears after a swap, it flags the replacement as unknown or degraded. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. That resets the BIOS learn cycle and the warning clears within one to two boot cycles.
The Windows battery icon shows a wildly wrong percentage — jumps from 60% to 5% with no warning on the ProBook 450 G6.
The fuel gauge IC calibrated itself to the old cell's specific voltage curve over months of use. A new cell has a slightly different curve at the same voltage points, so the IC misreads state-of-charge and produces erratic jumps. Run two to three complete discharge-to-hibernate cycles followed by uninterrupted charges to 100% each time. After those cycles the gauge IC re-maps to the new cell and percentage readings stabilise.
Windows shows this battery as 43Wh but HP Support Assistant reports a different Wh figure — which one is correct?
The 43.89Wh figure in the product data is the actual measured capacity of the cell chemistry. HP Support Assistant reads the Wh value stored in the battery EEPROM, which can differ slightly from the real-world chemistry rating depending on how the firmware rounds the figure. The discrepancy is a reporting difference between EEPROM-stored nominal data and measured cell capacity — it does not affect charge behaviour. Confirm the cell is charging normally by checking that voltage reaches 12.6V at full charge in HP Battery Check.
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