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Compaq Presario CQ35-100 Replacement Battery 10.8V 4400mAh

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From $92.99 USD $110.99
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Fits Compaq Presario CQ35-100 and compatible models; replaces HSTNN-C54C, HSTNN-IB82, HSTNN-OB93, and eight other OEM part numbers.
10.8V, 4400mAh (47.52Wh) lithium-ion cell restores full unplugged runtime on this mid-range notebook.
Connector slides straight into the bay slot with a single locking tab; no force needed.
We bench-tested this cell against the Presario's charging circuit; the BMS accepted a clean handshake on first insertion and held voltage under sustained CPU load.
After installation, run one full discharge to hibernate-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings.
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

4400mAh

Compaq Presario CQ35-100 Series — 10.8V Li-ion Replacement Battery (HSTNN-C54C)

This 10.8V, 4400mAh (47.52Wh) Li-ion battery replaces the original HSTNN-C54C and cross-references including 530801-001, HSTNN-IB82, HSTNN-LB93, and RT09. It fits the Compaq Presario CQ35-100 series and over 96 related CQ35 variants. The connector, voltage rail, and BMS communication profile match the OEM specification for this notebook line.

  • CQ35 series fit: The CQ35-100 through CQ35-102 and related TU/TX models share the same 10.8V three-cell-pair Li-ion architecture, identical bottom-panel connector pinout, and the same BMS handshake protocol — which is why one part number covers the full range.
  • Bench tested on actual hardware: We cycled this cell through charge, idle draw, and sustained CPU-plus-display load. The BMS held the charge cutoff correctly at full capacity and did not trip on the CQ35's moderate power draw profile.
  • Post-install calibration cycle: After fitting, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" warning that appears in HP Support Assistant after any cell swap on this platform.

Why the CQ35 BIOS reports a new battery as degraded or unknown

The CQ35 platform reads EEPROM data embedded in the battery pack to calculate health percentage. When a new cell arrives, that EEPROM reports a factory baseline that does not match the BIOS's stored discharge history from the old pack. The BIOS interprets the mismatch as a worn cell and flags poor health immediately. One full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the BIOS enough data to recalibrate its fuel gauge IC against the new cell's actual capacity curve.

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

This is a voltage cliff, not a capacity problem. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC predicts — the BIOS triggers an emergency shutdown before the percentage reaches zero. It happens most often in the first few cycles before calibration. Run two full discharge-to-hibernate cycles charged back to 100% each time, and confirm the battery voltage under load reads above 10.0V using HWMonitor or BatteryInfoView.

Compatible Models

Presario CQ35-100 Presario CQ35-101TU Presario CQ35-101TX Presario CQ35-102TU Presario CQ35-102TX Presario CQ35-103TU Presario CQ35-103TX Presario CQ35-104TU Presario CQ35-104TX Presario CQ35-105TU Presario CQ35-105TX Presario CQ35-106TU Presario CQ35-106TX Presario CQ35-107TU Presario CQ35-107TX Presario CQ35-108TU Presario CQ35-108TX Presario CQ35-109TU Presario CQ35-109TX Presario CQ35-110TU Presario CQ35-110TX Presario CQ35-111TU Presario CQ35-111TX Presario CQ35-112TU Presario CQ35-112TX Presario CQ35-113TU Presario CQ35-113TX Presario CQ35-114TU Presario CQ35-114TX Presario CQ35-115TU Presario CQ35-115TX Presario CQ35-116TU Presario CQ35-116TX Presario CQ35-117TU Presario CQ35-117TX Presario CQ35-118TX Presario CQ35-119TX Presario CQ35-120TX Presario CQ35-121TX Presario CQ35-122TX Presario CQ35-124TX Presario CQ35-125TX Presario CQ35-126TX Presario CQ35-127TX Presario CQ35-128TX Presario CQ35-129TX Presario CQ35-200 Presario CQ35-201TX Presario CQ35-203TX Presario CQ35-205TX Presario CQ35-206TU Presario CQ35-207TU Presario CQ35-211TX Presario CQ35-213TX Presario CQ35-214TX Presario CQ35-216TU Presario CQ35-217TX Presario CQ35-219TX Presario CQ35-222TX Presario CQ35-223TX Presario CQ35-224TX Presario CQ35-225TX Presario CQ35-226TX Presario CQ35-227TX Presario CQ35-228TX Presario CQ35-229TX Presario CQ35-110 Presario CQ35-118TU Presario CQ35-120 Presario CQ35-202TU Presario CQ35-202TX Presario CQ35-204TX Presario CQ35-208TU Presario CQ35-210 Presario CQ35-215TU Presario CQ35-217TU Presario CQ35-218TU Presario CQ35-220 Presario CQ35-230 Presario CQ35-230TX Presario CQ35-233TX Presario CQ35-235TX Presario CQ35-236TX Presario CQ35-238TX Presario CQ35-240 Presario CQ35-240TX Presario CQ35-241TX Presario CQ35-242TX Presario CQ35-243TX Presario CQ35-244TX Presario CQ36-100 Presario CQ36-103TX Presario CQ36-104TX Presario CQ36-105TX Presario CQ36-106TX Presario CQ36-108TX Presario CQ36-110 Presario CQ36-110TX Presario CQ36-113TX Presario CQ36-114TX

Replaces Part Numbers

HSTNN-C54C 500029-141 513127-251 530801-001 HSTNN-C52C HSTNN-IB82 HSTNN-IB83 HSTNN-LB93 HSTNN-OB93 HSTNN-OB94 NU090AA NU090AA#ABB RT09

Technical Specifications

Voltage10.8V
Amp Hours4400mAh
Capacity4400mAh
Rate47.52Wh
Net Weight315g /11.11 oz
Gross Weight465g /16.40 oz
Approximate Weight465g /16.40 oz
Dimension 204.00 x 53.10 x 20.10mm

Product Highlights

  • Brand: Compaq
  • 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 CQ35 shows the new battery as 0% or "unknown" in Windows — did I get a faulty pack?

The pack is not faulty. The fuel gauge IC in the CQ35 platform loses its reference point when the old cell is removed and cannot read the new cell's EEPROM until it runs a learn cycle. Charge the battery to 100%, disconnect the AC adapter, and let the laptop run until it hibernates on its own. Reconnect the charger and charge back to 100% without interruption — after one full cycle, Windows will display the correct percentage.

Windows Battery Report is showing the wrong Wh rating — it says something different from the 47.52Wh on the product listing.

The Wh figure in Windows Battery Report is pulled from the EEPROM on the cell, which stores a rated design capacity that can differ slightly from the actual chemistry tested at the bench. This is an EEPROM data difference, not a hardware fault. After two full calibration cycles — discharge to hibernate, charge uninterrupted to 100% — the reported full-charge capacity in Battery Report will converge closer to the actual 47.52Wh figure.

The CQ35 charges the new battery fine but HP Support Assistant keeps flagging it as needing replacement.

HP Support Assistant on this platform reads the BIOS battery health score, which is calculated from the old pack's discharge history stored in firmware — not from the new cell's actual performance. The score does not reset automatically on a cell swap. Run one full discharge-to-hibernate cycle then charge uninterrupted to 100% to force the BIOS learn cycle to update. After the cycle completes, reopen HP Support Assistant and run the battery check again — the flag clears once the BIOS has a fresh discharge dataset.

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