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HP ProBook 450 G8 11.4V Replacement Battery RH03XL 3850mAh

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From $83.99 USD $103.99
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Fits HP ProBook 450 G8, 430 G8, and 650 G8 laptops; replaces RH03XL and HSTNN-IB9P.
11.4V, 3850mAh Li-Polymer cell delivers 43.89Wh to restore full charge cycles.
Connector slides straight in; no locking tab — seat firmly until it clicks.
We bench-tested against a fresh ProBook 450 G8; BMS accepted the cell on first insertion.
After installation, run one complete discharge to hibernation, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false 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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this battery was just what I needed.

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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.

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⚠️ 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

11.4V

Amp

3850mAh

HP ProBook 450 G8 / 650 G8 / 430 G8 — 11.4V Li-Polymer Replacement Battery (RH03XL)

This is an 11.4V, 3850mAh (43.89Wh) Li-Polymer replacement battery for the HP ProBook 450 G8, 650 G8, and 430 G8 series notebooks. It fits using OEM part numbers RH03XL, HSTNN-IB9P, HSTNN-OB1T, and M01524-171, among others. It restores full portable operation when the original cell has degraded or failed.

  • ProBook 4x0/650 G8 platform fit: These three notebook lines share the same 11.4V three-cell Li-Polymer architecture, connector pinout, and BMS communication protocol — which is why a single part number covers all of them. The fuel gauge IC talks to HP's BIOS over the SMBus using the same EEPROM register map across the range.
  • Bench tested on actual hardware: We ran this cell in a ProBook 450 G8 and confirmed the BMS handshake completed correctly, charge accepted through all three charge stages, and the SMBus reported state-of-charge without errors. No thermal events occurred across three full charge-discharge cycles.
  • First-cycle calibration after install: After fitting this battery, run the laptop down to hibernate cutoff on normal workload — do not force shutdown — then charge uninterrupted to 100%. This forces the HP fuel gauge IC to re-learn the new cell's capacity curve and clears the inaccurate health warning that appears in HP Support Assistant after every cell swap.

BIOS reporting battery health as poor immediately after replacement

HP's BIOS reads health data from the battery's EEPROM on first boot. When a new cell arrives, the EEPROM cycle count is at zero and the full-charge capacity figure does not yet match the BIOS's learned value from the old cell — so it flags the battery as unknown or poor. This is not a fault with the replacement unit. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%, and the BIOS battery learn cycle will update the stored capacity data. After one or two calibration cycles, HP Support Assistant should report normal health status.

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

This symptom means the fuel gauge IC's charge map is out of sync with the new cell's actual voltage curve. The gauge reports 20–30% remaining, but the cell voltage has already dropped below the BMS cutoff threshold under combined CPU and display load — so the system shuts off hard. It is a calibration gap, not a defective battery. Force a full discharge to hibernate (not sleep — hibernate) so the BMS logs the true empty voltage, then charge to 100% without interruption. After two full cycles the gauge should track accurately and the premature shutdowns will stop.

Compatible Models

ProBook 450 G8 ProBook 650 G8 ProBook 430 G8 ProBook 430 G8 203F4EA ProBook 430 G8 203F6EA ProBook 430 G8 Notebook PC ProBook 430 G827H93EA ProBook 430 G827H99EA ProBook 430 G828K79UT ProBook 430 G828K80UT ProBook 430 G828K82UT ProBook 430 G82H0N5PA ProBook 430 G82R9C7EA ProBook 430 G82T3Z5PA ProBook 430 G82W1G0EA ProBook 430 G82W1H2EA ProBook 430 G82X7F9EA ProBook 430 G82X7M8EA ProBook 430 G82X7T3EA ProBook 430 G82X7T9EA ProBook 430 G82X7U3EA ProBook 430 G82Z5G8PA ProBook 430 G8326S8PA ProBook 430 G8326S9PA ProBook 430 G8326T1PA ProBook 430 G8348D6PA ProBook 430 G834P96ES ProBook 430 G834P98ES ProBook 430 G8365G0PA ProBook 430 G8365G3PA ProBook 430 G8365G5PA ProBook 440 G8 203D9EA ProBook 440 G8 203F0EA ProBook 440 G8 203F8EA ProBook 440 G8 26M74LT ProBook 440 G8 28K85UT ProBook 440 G8 28K88UT ProBook 440 G8 28K89UT ProBook 440 G8 2M2U3ES ProBook 440 G8 2Q525AV ProBook 440 G8 2Q528AV ProBook 440 G8 2R9D0EA ProBook 440 G8 2X7F6EA ProBook 440 G8 2Z5H0PA ProBook 440 G8 326U1PA ProBook 440 G8 342H3PA ProBook 440 G8 364C0PA ProBook 440 G8 365L8PA ProBook 440 G8 365L9PA ProBook 440 G8 Notebook PC ProBook 440 G8-2W1G4EA ProBook 445 G8 32P23EA ProBook 445 G8 3A5L4EA ProBook 445 G8 3A5M2EA ProBook 445 G8 3C9F3PA ProBook 445 G8 3N8U7PA ProBook 445 G8 3P0H6PA ProBook 445 G8 3T0P1PA ProBook 445 G8 43A04EA ProBook 445 G8 4D946PA ProBook 445 G8 4J221UT ProBook 445 G8 4K782EA ProBook 445 G8 4K784EA ProBook 445 G8-3Z6Q8ES ProBook 450 G8 150C7EA ProBook 450 G8 27J14EA ProBook 450 G8 27J71EA ProBook 450 G8 28K98UT ProBook 450 G8 2E9F8EA ProBook 450 G8 2E9G0EA ProBook 450 G8 2H0W6PA ProBook 450 G8 2W1G6EA ProBook 450 G8 2W1G9EA ProBook 450 G8 2X7K6EA ProBook 450 G8 2X7N7EA ProBook 450 G8 2X7U1EA ProBook 450 G8 2X7X3EA ProBook 450 G8 2Z5H3PA ProBook 450 G8 32M35EA ProBook 450 G8 34P88ES ProBook 450 G8 365M3PA ProBook 450 G8 365M4PA ProBook 450 G8 3C2V8ES ProBook 450 G8 3D3X4PA ProBook 450 G8 Notebook PC ProBook 630 G8 24Z99EA ProBook 630 G8 250A0EA ProBook 630 G8 250C2EA ProBook 630 G8 250D7EA ProBook 630 G8 250D9EA ProBook 630 G8 28L02UT ProBook 630 G8 2B0D7UT ProBook 630 G8 2T4A4PA ProBook 630 G8 2Y2H9EA ProBook 630 G8 2Y2J8EA ProBook 630 G8 2Y2M4EA ProBook 630 G8 2Y2M8EA ProBook 630 G8 364J2PA ProBook 630 G8 364J4PA ProBook 630 G8 36L60PA ProBook 630 G8 36L61PA ProBook 630 G8 3A6B8EA ProBook 630 G8 3E2M3UT ProBook 630 G8 3E4F6UT ProBook 630 G8 3S8M8EA ProBook 640 G8 13L73AA ProBook 640 G8 2503QEA ProBook 640 G8 250A1EA ProBook 640 G8 250A3EA ProBook 640 G8 250B9EA ProBook 640 G8 250F2EA ProBook 640 G8 250H6EA ProBook 640 G8 28L11UT ProBook 640 G8 2B0E0UT ProBook 640 G8 2Q011AV ProBook 640 G8 2Y2J1EA ProBook 640 G8 2Y2J2EA ProBook 640 G8 2Y2K1EA ProBook 640 G8 2Y2N2EA ProBook 640 G8 308V7PA ProBook 640 G8 364J9PA ProBook 640 G8 36L66PA ProBook 640 G8 36L68PA ProBook 640 G8 3E2L8UT ProBook 640 G8 3E2M0UT ProBook 640 G8 3N8H5US ProBook 640 G8 3S8N0EA ProBook 640 G8 3S8T3EA ProBook 650 G8 250A5EA ProBook 650 G8 250A6EA ProBook 650 G8 250C7EA ProBook 650 G8 250F8EA ProBook 650 G8 250K7EA ProBook 650 G8 27J71EA ProBook 650 G8 28L15UT ProBook 650 G8 2T4D1PA ProBook 650 G8 2Y2H7EA ProBook 650 G8 2Y2J3EA ProBook 650 G8 2Y2J9EA ProBook 650 G8 2Y2N4EA ProBook 650 G8 2Y2N6EA ProBook 650 G8 364K2PA ProBook 650 G8 364K6PA ProBook 650 G8 36L72PA ProBook 650 G8 3E2L5UT ProBook 650 G8 3E2L6UT Probook 440 G8 364C1PA Probook 630 G8 Probook 640 G8 Probook 650 G8 Notebook PC

Replaces Part Numbers

RH03XL HSTNN-IB9P HSTNN-OB1T M01524-171 M01524-AC1 M02027-005 M01524-2B1 M01524-2C1 M01524-541

Technical Specifications

Voltage11.4V
Amp Hours3850mAh
Capacity3850mAh
Rate43.89Wh
Net Weight183g /6.46 oz
Gross Weight443g /15.63 oz
Approximate Weight443g /15.63 oz
Dimension 249.40 x 76.20 x 5.70mm

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 the battery Wh rating is wrong after I installed this replacement — is the cell faulty?

The Wh figure shown in HP Support Assistant is pulled from the battery's EEPROM, which stores the manufacturer-rated value for the original cell chemistry. A fresh replacement cell's EEPROM data won't match the worn-out cell the BIOS had previously learned. This is a data mismatch, not a hardware fault. Run one full discharge-to-hibernate cycle followed by a complete charge to 100% and the reported Wh value will align with the cell's actual capacity.

The charge stopped at 80% and won't go higher — did something go wrong during installation?

No installation error caused this. HP BIOS firmware on the ProBook G8 series includes a charge limit feature that caps charging at 80% to reduce long-term cell stress — it can be enabled accidentally or may default to on after a BIOS update. Open HP OMEN Gaming Hub or HP Command Center if installed, or go to BIOS Setup (F10 at boot) and look for Battery Care Function or Adaptive Battery Optimizer. Disable the charge limit setting, reboot, and the battery will charge to 100%.

The battery percentage jumps around wildly — it reads 60%, then drops to 15% in minutes without heavy use. What is happening?

The fuel gauge IC on this platform uses a learned model of the cell's voltage-to-capacity curve, and after a cell swap that model is calibrated to the old, degraded cell — not the new one. The result is large, unpredictable jumps in the displayed percentage. Let the laptop discharge fully to hibernate cutoff on real workload, then charge uninterrupted to 100% without unplugging partway through. Repeat that cycle twice and the fuel gauge IC will have enough data points to track the new cell's curve accurately.

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