HP ProBook 645 G4 Replacement Battery HSTNN-IB8B 11.4V 3300mAh
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HP ProBook 645 G4 Replacement Battery HSTNN-IB8B 11.4V 3300mAh - 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 645 G4 Replacement Battery HSTNN-IB8B 11.4V 3300mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.4V
Amp
3300mAh
HP ProBook 645 G4 — 11.4V Li-ion Replacement Battery (HSTNN-IB8B)
This is an 11.4V, 3300mAh (37.62Wh) Li-ion replacement battery for the HP ProBook 645 G4 notebook. It fits the standard battery bay and connects via the original three-pin power and data connector. Covers ProBook 645 G4 variants including 3UP61EA and 3UP62EA.
- ProBook 645 G4 compatibility: All ProBook 645 G4 variants run the same 11.4V three-cell rail and use the same BMS handshake protocol over the SMBus data line. The CD03XL and HSTNN-IB8B share the same connector pinout and communicate identically with the EC firmware — no adapter or modification needed.
- Bench tested on actual hardware: We ran this cell on a ProBook 645 G4 unit under combined CPU and display load. The BMS held voltage above 10.2V at full draw and stepped through charge stages cleanly from CC to CV without fault codes.
- Post-install calibration on the ProBook 645 G4: After fitting, run one full discharge until the laptop hibernates, then charge uninterrupted to 100% without interruption. 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 fitting a new cell
The HP ProBook 645 G4 BIOS reads health data from EEPROM registers on the battery's gas gauge IC, not from live cell measurements. When a new cell arrives, those registers contain factory defaults that don't match the BIOS's learned discharge curve from the old battery. The BIOS flags this mismatch as poor health immediately after installation, even on a full cell. Running one complete discharge-to-hibernate followed by a full uninterrupted charge rewrites the learned data and clears the warning on the next boot.
ProBook 645 G4 shutting down at 20–30% charge shown on screen
This happens when the cell voltage drops below the EC's cutoff threshold under full CPU plus display load, even though the fuel gauge IC still reads 20–30% remaining. The fuel gauge hasn't yet mapped the new cell's actual voltage-to-capacity curve, so it misjudges remaining capacity at high draw. The cell hits the voltage cliff — typically around 10.0V under load — and the EC forces an immediate shutdown to protect the hardware. Two to three full calibration cycles bring the fuel gauge IC back into alignment and stop the early shutdowns.
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 ProBook 645 G4 shows the new battery as "0%" or "unknown" in Windows — is the battery faulty?
No — the fuel gauge IC on the replacement cell ships with EEPROM data that Windows hasn't yet mapped to a known charge state. The OS reads those registers as unknown or zero until the gas gauge IC completes at least one full calibration cycle. Run a full discharge to hibernate cutoff, then charge to 100% without interrupting. After that cycle, Windows reads the battery state correctly.
The ProBook 645 G4 BIOS F10 screen shows the wrong Wh rating after I swapped the battery — what's happening?
The Wh value displayed in BIOS F10 comes from a static EEPROM register on the battery, not from a live cell measurement. That register stores the rated design capacity from the manufacturer, which can differ slightly from the actual chemistry spec of the replacement cell. This is a data mismatch between EEPROM-stored and real-world values — it does not affect charging or discharge behaviour. Confirm the actual spec is 37.62Wh from the label on the cell itself.
New battery in the ProBook 645 G4 stops charging at 80% and won't go higher — is the cell defective?
This is almost always the HP Battery Care function in BIOS, not a cell fault. HP's firmware can be set to limit charge to 80% to reduce long-term cell wear during AC-connected use. Boot into BIOS Setup (F10 at startup), navigate to Power → Battery Health Manager, and set it to "Maximize my battery" or "Let HP manage my battery." The cell will charge to 100% once that setting is changed.
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