HP Pavilion TX2600 11.1V Replacement Battery HSTNN-CB45 3600mAh
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HP Pavilion TX2600 11.1V Replacement Battery HSTNN-CB45 3600mAh - 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 Pavilion TX2600 11.1V Replacement Battery HSTNN-CB45 3600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
3600mAh
HP Pavilion TX2600 Series — 11.1V Li-ion Replacement Battery (HSTNN-CB45)
This is an 11.1V 3600mAh (39.96Wh) Li-ion replacement battery for the HP Pavilion TX2600, TX2601, TX2602, and TX2603 convertible notebook. It fits the OEM battery bay and connects via the original multi-pin connector. Replaces HSTNN-CB45, HSTNN-OB45, HSTNN-W26C, 436426-351, and a range of compatible HP part numbers.
- TX2600 series fitment: The TX2600 through TX2603 share the same 11.1V battery rail, connector pinout, and BMS handshake protocol. One cell covers the full run of these convertible tablet-notebook units without any adapter or modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on TX2600 hardware. The BMS communicated correctly with the BIOS, reported accurate state-of-charge, and did not trigger any abnormal charge cutoff or thermal event.
- Post-install calibration tip: After fitting this cell, run the laptop down to hibernate cutoff on battery power alone — no AC — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" flag that appears after almost every cell swap on this platform.
Why the TX2600 BIOS reports poor battery health after a fresh cell swap
The TX2600 stores battery health history in the BIOS and reads EEPROM data from the outgoing cell. When a new cell goes in, that stored data does not match the fresh chemistry — the BIOS flags it as degraded before a single charge cycle runs. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by a complete charge clears the mismatch. After two to three full cycles, BIOS health reporting aligns with the actual cell state.
TX2600 shutting down at 20–30% charge shown on the gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's discharge curve. The gauge was mapped to the old, degraded cell — it cannot accurately predict the voltage cliff on a fresh battery. Under combined CPU and display load, the cell voltage drops faster than the stale gauge predicts, and the BIOS cuts power before the displayed percentage reaches zero. Run two full discharge-to-hibernate cycles without interruption, and the fuel gauge IC re-maps to the new cell. The shutdown-at-20% behaviour stops once calibration completes.
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
My HP Pavilion TX2600 shows the battery as "unknown" or 0% right after I installed the new cell — what's wrong?
The BIOS pulls identity and history data from the old cell's EEPROM. When that data is gone, it reports the new cell as unknown until a learn cycle runs. Plug in the AC adapter and let the battery charge uninterrupted to 100%, then drain it fully to hibernate cutoff on battery power alone. After one complete cycle, the BIOS recognises the cell and the 0% or unknown flag clears.
Windows is saying this replacement battery has a different Wh rating than the original — is the cell wrong?
It is not a fault with the cell. The Wh value Windows reads comes from the EEPROM embedded in the battery pack, and the rated figure stored there can differ slightly from the actual chemistry capacity of a replacement cell. The TX2600 system will still charge and discharge correctly at 11.1V. After two full calibration cycles the reported Wh figure in Windows often converges closer to the actual 39.96Wh spec of this cell.
The new battery stopped charging at 80% and won't go higher — is the cell defective?
Not a cell defect. HP's BIOS on this platform includes a charge limit setting that caps charging at 80% to reduce heat stress during long AC-connected sessions. Check HP Power Manager or the BIOS battery settings — the "Battery Saver" or "Optimised" charge mode is likely active. Switch it to "Maximum Charge" or "Full Capacity", then run a full charge cycle to confirm the cell reaches 100%.
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