HP EliteBook 850 11.1V Replacement Battery HSTNN-DB4Q
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HP EliteBook 850 11.1V Replacement Battery HSTNN-DB4Q - 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 EliteBook 850 11.1V Replacement Battery HSTNN-DB4Q - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4500mAh
HP EliteBook 850 G1 — 11.1V Li-Polymer Replacement Battery (HSTNN-DB4Q)
This 11.1V, 4500mAh (49.95Wh) Li-Polymer battery fits the HP EliteBook 850 and EliteBook 850 G1 series. It replaces OEM part numbers including CM03XL, CO06XL, and HSTNN-IB4R. Use it when the original cell no longer holds a charge or when BIOS flags battery health as critical.
- EliteBook 850 and Z-series compatibility: These notebooks share the same 11.1V power rail, six-pin BMS connector, and EEPROM handshake protocol — which is why a single cell SKU covers the full EliteBook 850 G1 range and several Z-series models. The BMS communicates state-of-charge data directly to the BIOS over SMBus.
- Bench tested on actual hardware: We ran this cell on an EliteBook 850 G1 under combined CPU and display load. The BMS held the voltage rail above 10.2V through discharge and did not trigger an unexpected cutoff. BIOS battery status updated correctly after one full charge cycle.
- First-cycle reset after install: After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting battery health as poor immediately after replacement
The EliteBook 850 G1 BIOS stores charge history and health metrics in the old cell's EEPROM. When a new cell is installed, the BIOS compares its stored data against a blank EEPROM and flags the health as unknown or poor. This is not a fault with the replacement cell — it is a data mismatch. Running the battery learn cycle (full discharge to hibernate, then an uninterrupted charge to 100%) overwrites the stored baseline with data from the new cell. After two full cycles, BIOS health reporting normalises.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's discharge curve. The IC uses data from the previous cell and predicts cutoff too early — the display reads 25% but the cell voltage has already dropped below the BMS floor under full CPU and display load. It is not a faulty battery. Run two complete discharge-to-hibernate and full-charge cycles so the fuel gauge IC re-maps the voltage cliff for this specific cell. After calibration, the gauge will read accurately down to the true cutoff at approximately 9.9V.
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 Support Assistant says my new battery has a 0 Wh rating — is the cell dead?
The Wh figure shown in HP Support Assistant is pulled from the EEPROM on the battery itself, and a freshly installed cell reports 0 Wh until the BIOS completes its first learn cycle. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. After that cycle completes, the BIOS re-reads the EEPROM and the correct 49.95Wh figure populates in Support Assistant.
Charge stops at 80% and will not go higher — the laptop just sits there plugged in
The EliteBook 850 G1 BIOS includes a battery charge limit feature that caps charging at 80% when "Battery Health Manager" is set to "Maximize Battery Health" in BIOS settings. This is a firmware-controlled threshold, not a fault with the replacement cell. Go to BIOS (F10 at boot), navigate to Power → Battery Health Manager, and switch the setting to "Let HP manage my battery charging." The battery will then charge to 100%.
OS fuel gauge jumps erratically — reads 60%, drops to 40%, then climbs back up mid-session
The fuel gauge IC recalibrates against a new cell's discharge curve over the first few charge cycles, and until it does, the readings are unstable. The IC is mapping where voltage sags occur under varying loads, and the EliteBook 850 G1's SMBus reporting amplifies that noise on screen. Run three complete discharge-to-hibernate and full-charge cycles without interrupting mid-session. By the third cycle, the gauge IC will have built an accurate curve and the readings will stabilise.
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