Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Compaq Business Notebook 6530s 10.8V Replacement Battery 484785-001

Up to 17% off
New arrival
From $124.99 USD $149.99
Shipping calculated at checkout.
Fits Compaq Business Notebook 6530s, 6535S, 6520S, 6531s; replaces OEM part 484785-001, HSTNN-DB51, 500014-001, KU530AA, HSTNN-OB51, 456623-001, 451545-361, 451545-261.
10.8V, 6600mAh lithium-ion cell delivers 71.28Wh; matches the original power output for this business-class notebook without voltage sag.
Connector slides into the underside battery bay with a single plastic locking tab; orientation marked on the slot prevents reverse insertion.
We ran full charge cycles on the 6530s platform; the BMS accepted the new cell without fault codes and held voltage under sustained CPU and display load.
After installation, discharge fully to hibernate cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after cell replacement.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 12 reviews

I'm writing this review to express my deep gratitude and appreciation for the quality of services provided to me by the BatteryWeb service team. I visited BatteryWeb to purchase a replacement battery for my Remington R9 razor. The staff was very responsive and I was really impressed with their willingness to help me and make the purchasing process as quick as possible. In particular I greatly appreciate the work of staff member Shane who was friendly and helpful.
In conclusion, I believe that BatteryWeb has excellent service staff who make their customers feel honored and valued.
I wish you all the best.
Sincerely,
Michael

Michael Talianker
BatteryWeb

this battery was just what I needed.

Robert Jones
BatteryWeb

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

Great deal for the money.

Linda M.
BatteryWeb

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

6600mAh

Compaq Business Notebook 6530s Series — 10.8V Li-ion Replacement Battery (484785-001)

This 10.8V, 6600mAh Li-ion battery replaces the original pack in the Compaq Business Notebook 6530s, 6535s, 6520s, and 6531s. It fits the physical bay and connector used across this notebook family. OEM part numbers 484785-001, HSTNN-DB51, 500014-001, KU530AA, HSTNN-OB51, 456623-001, 451545-361, and 451545-261 all cross to this cell.

  • 6500-series notebook compatibility: The 6520s, 6530s, 6531s, and 6535s share the same 10.8V three-cell voltage rail, identical connector pinout, and the same BMS handshake protocol — so one cell covers the full family without adaptation.
  • Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS handshake verification on the 6530s platform. The protection circuit communicated correctly with the HP EC firmware, and charge termination triggered cleanly at full capacity.
  • Post-install calibration on the 6530s: After fitting, run one full discharge until the laptop hibernates, then charge uninterrupted to 100% without interruption. 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 on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The 6530s reads EEPROM data written by the original cell and compares it against current charge cycles and voltage behaviour. A brand-new cell presents data that doesn't match that history, so the BIOS flags it as degraded. This is a firmware interpretation issue, not a fault with the replacement. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — this re-trains the gauge IC and the BIOS health flag clears within one to two cycles.

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

This happens when the fuel gauge IC hasn't calibrated against the new cell's actual voltage curve yet. The gauge reads 25% remaining, but the cell voltage is already dropping below the sustain threshold under combined CPU and display load — so the EC cuts power before the OS can act. It's not a defective cell; it's an uncalibrated gauge. Complete two full discharge-to-hibernate then uninterrupted-charge cycles, and the cutoff point will shift down to the correct 5–8% range. After calibration, confirm the cell holds above 10.0V under load at the 15% gauge mark.

Compatible Models

Business Notebook 6530s Business Notebook 6535S Business Notebook 6520S Business Notebook 6531s

Replaces Part Numbers

484785-001 HSTNN-DB51 500014-001 KU530AA HSTNN-OB51 456623-001 451545-361 451545-261

Technical Specifications

Voltage10.8V
Amp Hours6600mAh
Capacity6600mAh
Rate71.28Wh
Net Weight478g /16.86 oz
Gross Weight788g /27.80 oz
Approximate Weight788g /27.80 oz
Dimension 269.00 x 50.10 x 39.20mm

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

Why does Windows show the Compaq 6530s battery as "0% available (plugged in, not charging)" right after I installed it?

The fuel gauge IC on the 6530s needs at least one full reference cycle before it can report state-of-charge accurately against a new cell. The EEPROM from the old pack left a charge baseline the new cell doesn't match, so the OS reads zero until the gauge resets. Run the laptop on battery until it hibernates, then plug in and charge without interruption to 100%. After that cycle the percentage will read and track correctly.

The system info screen shows the wrong Wh rating for this battery — it says 47Wh but the battery is rated 71.28Wh. Is something wrong?

Nothing is wrong with the cell. The Wh figure displayed in Windows or HP Support Assistant is pulled from the EEPROM embedded in the battery controller, which may carry the rated value from the original OEM cell's chemistry spec rather than the actual cell installed. The 6530s EC does not rewrite that EEPROM field after a swap. The cell itself is 71.28Wh — confirm this by checking the label on the battery casing directly. The discrepancy does not affect charging or discharge behaviour.

My 6530s stops charging at 80% and won't go higher — is this a faulty replacement battery?

The 6530s BIOS includes a battery charge limit setting that caps charging at 80% when battery care mode is enabled in HP Power Manager or the BIOS power settings. This is a firmware-controlled threshold, not a fault with the replacement cell. Open the BIOS at startup, navigate to the Power menu, and confirm "Battery Care Function" is set to "Full Charge" rather than "80% Charge." Once changed, the battery will charge to 100% on the next cycle.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

HP 540 Replacement Battery, 10.8V, 6600mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections