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HP ProBook 640 G1 Compatible Battery CA06XL 10.8V 8400mAh

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From $94.99 USD $113.99
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Fits HP ProBook 640 G1 and replaces CA06XL, HSTNN-IB4W, HSTNN-LB4X, and 718755-001.
10.8V lithium-ion at 8400mAh delivers sustained output for full workday operation on this form factor.
Connector is a standard three-pin horizontal slot; no locking tab — seats flush into the battery bay under the rear panel.
Bench testing showed the BMS accepted charge immediately; voltage ramp was linear through the first two cycles with no early cutoff events.
After installation, run one full discharge to hibernation then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false health warnings that appear after every cell swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

10.8V

Amp

8400mAh

HP ProBook 640 G1 — 10.8V Li-ion Replacement Battery (CA06XL)

This is a 10.8V, 8400mAh (90.72Wh) Li-ion battery for the HP ProBook 640 G1, ProBook 640, ProBook 645, and ProBook 655. It replaces OEM part CA06XL and its associated cross-reference numbers. Install it when the original cell no longer holds a charge or the BIOS flags battery health as poor.

  • ProBook 640/645/655 compatibility: These models share the same 10.8V battery rail, connector pinout, and SMBus BMS handshake protocol. One cell covers the full range without firmware conflicts.
  • Bench tested on actual hardware: We ran this cell on a ProBook 640 G1 unit. The BMS initialised correctly, charge accepted across all three cells, and the fuel gauge IC began calibration without manual intervention.
  • Post-install discharge cycle: After installing, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting battery health as poor after installing a new cell

The ProBook 640 G1 BIOS reads health data stored in the battery's EEPROM, not from live cell measurements. When a new cell is fitted, the EEPROM counters reset to zero and the BIOS interprets this as an unrecognised or degraded pack. This is not a fault with the replacement cell. Run the battery learn cycle — discharge fully to hibernate cutoff, then charge to 100% without interruption — and the BIOS health indicator will update correctly within one to two cycles.

Laptop shuts down abruptly at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The reported percentage and the real cell voltage diverge, and the system cuts power before the gauge catches up. It is most likely to occur under full CPU and display load, where voltage sag is steepest. Complete two full discharge-to-hibernate and uninterrupted full-charge cycles, and the fuel gauge will track actual cell voltage accurately — confirmed at 10.8V nominal under load in our bench tests.

Compatible Models

ProBook 640 G1 ProBook 640 ProBook 645 ProBook 655 ProBook 650 G1 ProBook 645 G1 ProBook 655 G1 ProBook 655 G1 (F4Z43AW) ProBook 650 G1 (K9V50AV) ProBook 650 G1 (F4M01AW) ProBook 645 G1 (F4X77AW) ProBook 650 G1 (D3B21AV) ProBook 650 G1 (D9S34AV) ProBook 645 G1 (K9V88AV) ProBook 645 G1 (F4N64AA) ProBook 655 G1 (F4Z47AA) ProBook 650 G1 (D9S32AV) ProBook 650 G1 (K9V53AV) ProBook 645 G1 (F4N62AW) ProBook 655 G1 (F4Z44AW) D9R52AV ProBook 650 G1 (K9V51AV) ProBook 650 G1 (F4M02AW) ProBook 655 G1 (F4Z42AW) ProBook 650 G1 (K9V49AV) ProBook 650 G1 (D9S35AV) H5G74E ProBook 650 G1 (J6J48AW) ProBook 645 G1 (F4N65AA) ProBook 645 G1 (D2Z92AV) ProBook 650 G1 (D9S33AV) ProBook 645 G1 (K9V87AV) ProBook 645 G1 (F4N63AW) ProBook 655 G1 (F4Z45AW) ProBook 645 G1 (D9E30AV) ProBook 650 G1 (K9V52AV) ProBook 650 G1 (F4M04AA) ProBook 650 ProBook 650 G0 ProBook 645 G0 ProBook 655 G0 ProBook 640 G0

Replaces Part Numbers

CA06XL HSTNN-IB4W HSTNN-LB4X 718755-001 718675-121 718675-141 718675-142 718676-121 718676-141 718676-221 718676-241 718676-421 718677-121 718677-122 718677-141 718677-221 718677-222 718677-241 718677-421 718677-422 718678-221 718678-241 718678-421 718754-001 718756-001 718757-001 7718678-421 CA06 CA06055XL CA09 E7U21AA E7U22AA HSTNN-DB4X HSTNN-DB4Y HSTNN-I15C-4 HSTNN-I15C-5 HSTNN-I16C HSTNN-LB4Y HSTNN-LB4Z HSTNN-LP4Z CA09100XL HSTNN-DB4Z

Technical Specifications

Voltage10.8V
Amp Hours8400mAh
Capacity8400mAh
Rate90.72Wh
Net Weight449g /15.84 oz
Gross Weight599g /21.13 oz
Approximate Weight599g /21.13 oz
Dimension 204.20 x 67.70 x 22.10mm

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

My ProBook 640 G1 shows the new battery as "0% available (plugged in, not charging)" — what's happening?

The SMBus handshake between the battery BMS and the HP charging controller sometimes stalls on first insertion if the old cell's data is still cached. Shut the laptop down completely, remove the battery, hold the power button for 15 seconds to drain residual charge from the board, then reinsert the battery and power on. If the charge controller still won't engage, boot into the BIOS and check that the battery is detected under the Power menu — a detected battery that won't charge points to a BIOS-controlled charge limit set below the current cell voltage, which you can clear by resetting BIOS defaults.

The Wh rating showing in HP Support Assistant doesn't match the 90.72Wh on the product listing — is the cell underspec?

It isn't. The Wh figure displayed in HP Support Assistant is pulled from the EEPROM data embedded in the battery's BMS chip, which stores the rated capacity of the original OEM cell design. The actual electrochemical capacity of the replacement cell may differ slightly from that stored value without affecting real-world performance. After one full discharge-to-hibernate and a complete charge cycle, compare the reported Wh against the label — if the discrepancy is under 5Wh, the EEPROM value is simply an OEM artefact, not a defect.

Fuel gauge jumps erratically — shows 60%, then drops to 15% within minutes on the ProBook 640 G1

The fuel gauge IC on this platform calibrates its discharge model against the specific impedance profile of the installed cell. A new cell has a different internal resistance curve than the worn-out cell it replaced, so the IC's stored model is wrong until it re-learns. The erratic jumps will settle after two complete discharge cycles — run the laptop on battery from 100% down to hibernate cutoff each time, then charge uninterrupted to 100%. After the second cycle, the fuel gauge IC will have enough data points to track the new cell accurately at all charge levels.

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