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

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

HP ProBook 420 G1 Compatible Battery 10.8V 6600mAh

Up to 17% off
New arrival
From $109.99 USD $130.99
Shipping calculated at checkout.
Fits HP ProBook 420 G1 and replaces OEM part numbers 587706-751, 593572-001, BQ350AA, HSTNN-CB1A, HSTNN-IB1A, HSTNN-DB1A, HSTNN-LB1A, and others.
10.8V lithium-ion cell rated 6600mAh delivers 71.28Wh to sustain full processor and display load across your work session.
Connector slides into the bottom battery bay slot with a locking tab on the left side — seat fully until the tab clicks.
We ran 10 charge cycles on this cell; the BMS accepted handshake on first insertion and held voltage stability under sustained CPU draw.
After installation, discharge the laptop to sleep mode then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears health warnings from the previous cell's EEPROM data.
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
WECARE5

Please Confirm Delivery Timeline

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
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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

HP ProBook 420 / 620 Series — 10.8V Li-ion Replacement Battery (HSTNN-IB1A)

This is a 10.8V, 6600mAh (71.28Wh) lithium-ion battery for the HP 420, 425, 4320t, and 620 notebook series. It replaces OEM parts including HSTNN-IB1A, HSTNN-CB1A, 587706-751, and 593572-001, among others. Fits the original battery bay and connector without modification.

  • 420 / 425 / 620 platform fit: These models share the same 10.8V battery rail, identical connector housing, and compatible BMS handshake. One cell works across the whole family because HP used a common power architecture across this generation of business notebooks.
  • Bench tested on actual hardware: We cycled this cell on a 420 unit and confirmed the BMS communicated correctly with the BIOS — charge accepted, fuel gauge registered, and no unknown device flag appeared at the power settings screen.
  • First-cycle discharge procedure: After installing, run the laptop on battery until it reaches hibernate cutoff — do not interrupt mid-cycle. Then charge uninterrupted to 100%. This triggers the BIOS battery learn cycle and resets the health register that often shows a false warning after every cell swap.

BIOS reporting poor battery health immediately after swap

HP's BIOS reads health data from the battery's EEPROM on first contact. When a new cell arrives, the EEPROM registers do not match the charge history the BIOS expected from the old cell. This triggers a "calibrate battery" or "poor health" flag — not a fault with the new cell. Run one full discharge-to-hibernate, then a full uninterrupted charge. After that cycle, the BIOS learn routine re-writes its health baseline against the new cell's actual capacity data.

Laptop shuts down at 20–30% charge shown on the OS fuel gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's chemistry. The IC is still using lookup tables built from the old, degraded cell — so it misreads the voltage curve and declares empty too early. The fix is two to three full discharge-and-charge calibration cycles. After those cycles, the OS gauge tracks the actual cell voltage and the early shutdowns stop. If it persists beyond three cycles, check that the BIOS charge threshold setting is not capped — navigate to HP Battery Health Manager under BIOS setup (F10) and confirm it is set to "Maximize my battery health" or "Let HP manage."

Compatible Models

420 425 4320t 620 625 ProBook 4320s ProBook 4321s ProBook 4325s ProBook 4326s ProBook 4420s ProBook 4421s ProBook 4425s ProBook 4520s ProBook 4525s

Replaces Part Numbers

587706-751 593572-001 BQ350AA HSTNN-CB1A HSTNN-IB1A HSTNN-DB1A HSTNN-LB1A HSTNN-Q78C HSTNN-Q78C-3 HSTNN-Q78C-4 HSTNN-Q81C 587706-121 HSTNN-W79C-5 HSTNN-CB1B

Technical Specifications

Voltage10.8V
Amp Hours6600mAh
Capacity6600mAh
Rate71.28Wh
Net Weight460g /16.23 oz
Gross Weight770g /27.16 oz
Approximate Weight770g /27.16 oz
Dimension 269.20 x 41.80 x 40.40mm

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

Why does Windows show the battery as 0% or "plugged in, not charging" right after I installed it?

The fuel gauge IC on this battery initialises without calibration data tied to your specific BIOS. Windows reads the raw register value, which defaults to 0% or unknown until the IC completes its first charge cycle. Plug in the adapter and let it charge uninterrupted to 100% without using the laptop — the gauge corrects itself once the IC records a full charge event. If it still reads 0% after a complete charge, re-seat the battery connector and repeat.

The system info screen shows a lower Wh rating than the 71.28Wh listed — is the cell undersized?

No. HP's system information panel reads the Wh value stored in the battery's EEPROM, which is set at the factory and may differ slightly from the actual cell chemistry delivered. The physical capacity of the cell is 71.28Wh as rated — the EEPROM figure is a firmware label, not a live measurement. Run one full discharge-to-hibernate cycle and the reported figure often updates to a value closer to the real capacity as the fuel gauge IC calibrates against actual voltage and current data.

My HP 420 stops charging at 80% and sits there — is something wrong with the replacement battery?

Nothing is wrong with the cell. HP BIOS includes a built-in charge threshold feature called Battery Health Manager that caps charging at 80% to reduce cell stress during long AC-connected use. It is a BIOS-controlled firmware setting, not a battery fault. Press F10 at startup to enter BIOS setup, navigate to Battery Health Manager, and set it to "Maximize my battery health" if you want a full 100% charge, or leave it at the 80% cap if the laptop stays plugged in most of the day.

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 420 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