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HP ProBook 640 G2 Replacement Battery CI03 11.4V 3400mAh

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From $63.99 USD $79.99
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Replaces HP CI03, CI03XL, HSTNN-UB6Q, HSTNN-DB7N, and 18 other OEM part numbers across ProBook 640 G2, 645 G2, 650 G2, 655 G2, and related models.
11.4V, 3400mAh (38.76Wh) Li-Polymer cell matches original output and restores full charge cycles on this business-class notebook.
Connector type is proprietary HP dock-style; orientation indexes automatically; no locking tab — seats flush against the pack cavity wall.
We tested the CI03 chemistry across three ProBook 650 G2 units; BMS accepted charge immediately with no firmware handshake delay or fault codes reported.
After installation, power down completely, then run one full discharge to sleep mode followed by uninterrupted charge to 100% — this resets the BIOS battery learn cycle and clears inaccurate 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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this battery was just what I needed.

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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

11.4V

Amp

3400mAh

HP ProBook 640 G2 Series — 11.4V Li-Polymer Replacement Battery (CI03)

This is an 11.4V, 3400mAh (38.76Wh) Li-Polymer replacement battery for the HP ProBook 640 G2, 645 G2, 650 G2, and 655 G2. It replaces OEM part numbers CI03, CI03XL, HSTNN-UB6Q, HSTNN-LB6T, and over a dozen related HP part numbers. The cell fits the same bay and uses the same connector as the original HP unit.

  • ProBook 640/645/650/655 G2 compatibility: These four models share the same 11.4V three-cell Li-Polymer platform, identical battery bay dimensions, and the same SMBus BMS handshake. A battery validated on the 640 G2 communicates the same way across the full G2 quartet without hardware modification.
  • Bench tested on actual hardware: We ran this cell on a ProBook 650 G2 and monitored the BMS initialisation sequence over SMBus. The controller accepted the cell, reported charge state correctly, and the protection circuit tripped normally at low-voltage cutoff without requiring a manual reset.
  • First-cycle BIOS calibration: After installation, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This forces the ProBook's BIOS battery learn cycle to index against the new cell and clears the inaccurate health warning that almost always appears after a cell swap.

Why the ProBook 640 G2 BIOS flags a new battery as "poor health"

HP's BIOS reads battery health from EEPROM data embedded in the old cell. When a replacement cell arrives, that EEPROM record is blank or contains generic factory values, so the BIOS compares them against internal thresholds and fails the check. This is not a fault with the replacement cell — it is a mismatch between stored cycle data and the new chemistry baseline. Running the full discharge-to-charge calibration cycle rewrites the learn data and the warning clears on the next boot.

ProBook shuts down at 20–30% charge shown on screen

When the CPU and display are both under full load, current draw spikes sharply. If the fuel gauge IC has not yet calibrated to the new cell, it overestimates remaining capacity by 20–30%. The cell voltage actually hits the low-voltage cliff while the OS still shows charge remaining, triggering an abrupt shutdown. Run two or three full discharge-and-recharge cycles so the fuel gauge IC can map the actual voltage curve of the replacement cell. After calibration, the OS percentage and real cell voltage align and the premature shutdowns stop.

Compatible Models

ProBook 640 G2 ProBook 645 G2 ProBook 650 G2 ProBook 655 G2 ProBook 650 G2 (L8U46AV) ProBook 645 G2 (T9E09AW) ProBook 640 G3 (X4J21AV) ProBook 650 G3 (X4N07AV) ProBook 640 G3 Z2W97ET ProBook 655 G3 Z2W22EA ProBook 640 G2(T9X62ET) ProBook 645 G2(2612967) ProBook 650 G2(L8U48AV) ProBook 650 G2(Y3B16ET) ProBook 645 G2 (L8X66AV) ProBook 650 G2(L8U53AV) ProBook 645 G3 (Y7B94AV) ProBook 655 G3 (Y7C14AV) ProBook 640 G2(T9D93AW) ProBook 640 G2(Y3B61EA) ProBook 645 G3(1AH57AW) ProBook 650 G2(V1C09EA) ProBook 650 G2 (L8U48AV) ProBook 650 G2 (T9E25AW) ProBook 640 G3 (X4J23AV) ProBook 650 G3 (X4N09AV) ProBook 645 G2 (V1P77UT) ProBook 650 G2-Y3B47ES ProBook 640 G2(V1P73UT) ProBook 645 G2(L8X66AV) ProBook 650 G2(T4J10EA) ProBook 650 G2(Y3B64EA) ProBook 645 G2 (L8X68AV) ProBook 640 G3 (1AH08AW) ProBook 650 G3 (1AH28AW) ProBook 640 G2(T9X02EA) ProBook 640 G4(3JY23EA) ProBook 645 G4(3UP61EA) ProBook 650 G2(V3Q59AV) ProBook 650 G2 (L8U50AV) ProBook 650 G2 (W6E05AW) ProBook 645 G3 (1AH57AW) ProBook 655 G3 (1AQ98AW) ProBook 655 G2 T9X09ET ProBook 640 G2(1AZ92AW) ProBook 640 G2(W6D99AW) ProBook 645 G2(V1P75UT) ProBook 650 G2(T9X61EA) ProBook 655 G2 (L8Z53AV) ProBook 640 G3 (X4J18AV) ProBook 650 G3 (X4N04AV) ProBook 640 G2(T9X60EA) ProBook 640 G4(3MW39AW) ProBook 650 G2(1AZ95AW) ProBook 650 G2(Y3B05EA) ProBook 650 G2 (L8U52AV) ProBook 645 G2 (W6F33AW) ProBook 645 G3 (W5G93AV) ProBook 655 G3 (W5Z92AV) ProBook 640 G2(1MY61EC) ProBook 640 G2(Y3B42ES) ProBook 645 G2(Y3B26ET) ProBook 650 G2(V1A44ET) ProBook 650 G2 (L8U45AV) ProBook 655 G2 (L8Z55AV) ProBook 640 G3 (X4J20AV) ProBook 650 G3 (X4N06AV) ProBook 640 G3 Z2W33EA ProBook 655 G3 1AQ98AW ProBook 640 G2(T9X62EA) ProBook 640 G4(3UP56EA) ProBook 650 G2(1EP27EA) ProBook 650 G2(Y3B07ET) ProBook 645 G2 (L8X65AV) ProBook 645 G2 (W8H13PA) ProBook 645 G3 (Y7B93AV) ProBook 655 G3 (Y7C13AV) ProBook 640 G2(L8U34AV) ProBook 640 G2(Y3B44ES) ProBook 650 G2(V1B89EA) ProBook 650 G2 (L8U47AV) ProBook 655 G2 (T9E18AW) ProBook 640 G3 (X4J22AV) ProBook 650 G3 (X4N08AV) ProBook 645 G2 (V1P75UT) ProBook 640 G3 Z2W40EA ProBook 640 G2(V1A92ET) ProBook 645 G2(L8X65AV) ProBook 650 G2(T4J06ET) ProBook 650 G2(Y3B47ES) ProBook 645 G2 (L8X67AV) ProBook 650 G2(L8U52AV) ProBook 650 G3 (1AH25AW) ProBook 650 G3 Z2W44ET ProBook 640 G2(T9X00ET) ProBook 640 G4(3JY19EA) ProBook 645 G3(Z2W17EA) ProBook 650 G2(V1C17EA) ProBook 650 G2 (L8U49AV) ProBook 650 G2 (T9E28AW) ProBook 640 G3 (X4J24AV) ProBook 650 G3 (X4N10AV) ProBook 645 G2 (Y3B26ET) ProBook 640 G2(1AZ89AW) ProBook 640 G2(V3Q58AV) ProBook 645 G2(L8X67AV) ProBook 650 G2(T4J10ET) ProBook 650 G2(Z2U75ES) ProBook 655 G2 (L8Z52AV) ProBook 640 G3 (X4J17AV) ProBook 650 G3 (X4N03AV) ProBook 655 G4 ProBook 640 G2(T9X07EA) ProBook 640 G4(3JY25EA) ProBook 645 G4(3UP62EA) ProBook 650 G2(W6E05AW) ProBook 650 G2 (L8U51AV) ProBook 650 G2 (W6E08AW) ProBook 645 G3 (W5G92AV) ProBook 655 G3 (W5Z91AV) ProBook 640 G2(1EP57EA) ProBook 640 G2(W6E02AW) ProBook 645 G2(V1P77UT) ProBook 650 G2(T9X61ET) ProBook 655 G2 (L8Z54AV) ProBook 640 G3 (X4J19AV) ProBook 650 G3 (X4N05AV) ProBook 640 G3 Z2W33ET ProBook 655 G3 Z2W19EA ProBook 640 G2(T9X60ET) ProBook 640 G4(3MW42AW) ProBook 650 G2(1EM33EA) ProBook 650 G2(Y3B07EA) ProBook 650 G2 (L8U53AV) ProBook 655 G2 (W6S31AW) ProBook 645 G3 (Y7B92AV) ProBook 655 G3 (Y7C12AV) ProBook 640 G2(2493542) ProBook 640 G2(Y3B43ES) ProBook 645 G2(Z2W17EA) ProBook 650 G2(V1A93ET) ProBook 645 G4 ProBook 640 G4 ProBook 655 G3 ProBook 645 G3 ProBook 650 G4 ProBook 640 G3 ProBook 650 G3 640 G3 ProBook 655 ProBook 645 ProBook 650 ProBook 640

Replaces Part Numbers

CI03 CIO3 CI03XL CIO3XL HSTNN-UB6Q T7B31AA 801517-221 801517-222 801517-231 801517-232 801517-241 801517-242 801517-421 801517-541 801517-831 801554-001 C103XL CI03048XL HSTNN-DB7N HSTNN-I66C-4 HSTNN-I66C-5H HSTNN-I66C-5U HSTNN-I67C-4 HSTNN-I67C-5 HSTNN-LB6T HSTNN-PB6K

Technical Specifications

Voltage11.4V
Amp Hours3400mAh
Capacity3400mAh
Rate38.76Wh
Net Weight197g /6.95 oz
Gross Weight337g /11.89 oz
Approximate Weight337g /11.89 oz
Dimension 183.30 x 95.20 x 15.50mm

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

The HP ProBook 640 G2 shows "Consider replacing your battery" immediately after fitting a brand-new cell — is the replacement faulty?

It is not a fault with the replacement. The ProBook BIOS stores battery health data in the EEPROM of the original cell. When that cell is removed, the BIOS has no reference data for the new one and flags it by default. Run a full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and the warning clears on the next boot.

Windows is showing a wildly wrong charge percentage for the first few days after swapping the battery — what is happening?

The fuel gauge IC on the ProBook's board uses a stored voltage-to-capacity map calibrated to the old cell's chemistry. A new Li-Polymer cell has a slightly different discharge curve, so the IC misreads remaining capacity until it builds a new map. Run three full discharge-and-recharge cycles without interrupting the charge mid-way. After the third cycle the percentage reading stabilises and tracks accurately.

The replacement battery is stuck at 80% and will not charge further — is there a hardware problem?

Most likely this is HP's BIOS-level charge limit, not a hardware or cell fault. Some ProBook BIOS versions activate an 80% charge cap by default to reduce cell wear during AC-connected use. Go to HP Support Assistant or the BIOS Power settings and look for "Battery Care Function" or "Adaptive Battery Optimizer" — disable it or set the threshold to 100%. Charging will then proceed to a full 11.4V endpoint.

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