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HP EliteBook 820 G3 SN03XL Replacement Battery 11.4V 3700mAh

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From $68.99 USD $85.99
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Fits HP EliteBook 820 G3 and 725 G3 laptops; replaces OEM part SN03XL and equivalent Hewlett-Packard battery part numbers.
Rated 11.4V at 3700mAh (42.18Wh) — matches stock capacity, sustains full CPU and display load on this ultrabook.
Connector seats into the bottom-panel bay with a single locking tab; no adapter needed, orientation is keyed.
We bench-tested this SN03XL equivalent against EliteBook 820 G3 firmware; the BMS accepted the new cell handshake on first insertion and charged to full without cutoff.
After install, run one full discharge to hibernate-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
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.

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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

3700mAh

HP EliteBook 820 G3 / 725 G3 — 11.4V Li-Polymer Replacement Battery (SN03XL)

This is an 11.4V, 3700mAh (42.18Wh) Li-Polymer replacement battery for the HP EliteBook 820 G3 and EliteBook 725 G3. It slots directly into the internal bay and connects to the same BMS handshake points as the original SN03XL cell. Use it when the original battery no longer holds charge through a standard workday away from the mains.

  • EliteBook 820 G3 and 725 G3 platform fit: Both models run the same 11.4V three-cell battery rail with identical connector pinout and BMS communication protocol — that is why one cell covers the full series, including the T9X45EA and X5N60UC variants.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an EliteBook 820 G3 unit, confirming the BMS handshake authenticated correctly, charge current ramped normally from CC to CV phase, and the protection circuit tripped at the expected low-voltage cutoff threshold.
  • EliteBook BIOS learn cycle after swap: After fitting this cell, run the laptop down to hibernate-cutoff on battery alone, then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning the firmware displays after every cell replacement.

BIOS reporting poor battery health immediately after installing a new cell

HP's BIOS reads health data from the battery's EEPROM and compares it against the charge history stored from the previous cell. A brand-new cell has a different EEPROM state, so the firmware flags it as degraded before any calibration data exists. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted full charge gives the BIOS enough data to update its health register. After that cycle, most units clear the warning and report normal status.

Laptop shuts down abruptly while the OS gauge still shows 20–30% remaining

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The IC is still referencing the old cell's voltage-to-capacity mapping, so it misjudges the remaining charge at high load. When the CPU and display draw full current together, the cell voltage drops below the BMS cutoff threshold before the gauge reaches 0%. Run two to three full discharge-to-hibernate cycles, charging to 100% each time, to let the fuel gauge IC re-map against the new cell. After calibration, the shutdown floor should align accurately with the displayed percentage.

Compatible Models

EliteBook 820 G3 EliteBook 725 G3 Elitebook 820 G3 (T9X45EA) EliteBook 820 G3 (X5N60UC) EliteBook 725 G3 (Y9B38EC) Elitebook 820 G3 (T9X51EA) EliteBook 820 G3 (Y0F12UP) EliteBook 820 G3 (V6J17EC) Elitebook 820 G3 (V1H01UT) EliteBook 820 G3 (Z8J19AW) EliteBook 820 G3 (P4F86PT) EliteBook 820 G3 (V6J34EC) EliteBook 725 G3 (1TS02EC) EliteBook 820 G3 (L4Q19AV) EliteBook 820 G3 (W0V69UP) EliteBook 725 G3 (P3A09AW) EliteBook 820 G3 (L4Q16AV) EliteBook 820 G3 (W2G37UC) EliteBook 725 G3 (T5L24PA) EliteBook 725 G3 (L8K51AV) EliteBook 820 G3 (W4R02UC) EliteBook 725 G3 (V1J84EP) EliteBook 725 G3 (T1C12UT) EliteBook 820 G3 (W5P06UP) EliteBook 725 G3 (V6J09EC) EliteBook 725 G3 (T4H57EA) EliteBook 820 G3 (W5P17UP) EliteBook 725 G3 (W4Z18AW) EliteBook 820 G3 (T7N76AW) EliteBook 820 G3 (X1D82UP) EliteBook 725 G3 (W8H12PA) Elitebook 820 G3 (T9X41ET) EliteBook 820 G3 (X5N58UC) EliteBook 725 G3 (Y2Q95UP) Elitebook 820 G3 (T9X46EA) EliteBook 820 G3 (X5N61UC) EliteBook 725 G3 (Y9B42EC) Elitebook 820 G3 (V1G98UT) EliteBook 820 G3 (Y0F44UP) EliteBook 820 G3 (T7N78AW) Elitebook 820 G3 (V1H02UT) EliteBook 820 G3 (Z8J21AW) EliteBook 820 G3 (P4F85PT) EliteBook 820 G3 (V6J37EC) EliteBook 725 G3 (1TT58EC) EliteBook 820 G3 (L4Q18AV) EliteBook 820 G3 (W0V92UP) EliteBook 725 G3 (P3A10AW) EliteBook 820 G3 (1GS43PA) EliteBook 820 G3 (W4Q36UC) EliteBook 725 G3 (T7A27UP) EliteBook 725 G3 (N0J25AV) EliteBook 820 G3 (W4T53EP) EliteBook 725 G3 (V3Z23UP) EliteBook 725 G3 (T1C14UT) EliteBook 820 G3 (W5P13UP) EliteBook 725 G3 (V7B53UC) Elitebook 820 G3 (L3Z41UT) EliteBook 820 G3 (W5P19UP) EliteBook 725 G3 (W4Z20AW) Elitebook 820 G3 (T9X25ET) EliteBook 820 G3 (X1W46UP) EliteBook 725 G3 (X1U88UP) Elitebook 820 G3 (T9X43ET) EliteBook 820 G3 (X5N59UC) EliteBook 725 G3 (Y3T21UC) Elitebook 820 G3 (T9X46ET) EliteBook 820 G3 (X7Z74PC) EliteBook 725 G3 (Z9X83AW) Elitebook 820 G3 (V1G99UT) EliteBook 820 G3 (Z6Z46PA) EliteBook 820 G3 (T7N74AW) Elitebook 820 G3 (V1H03UT) EliteBook 725 G3 (1TS00EC) EliteBook 820 G3 (P4F84PT) EliteBook 820 G3 (V8N35PA) EliteBook 725 G3 (1TW90EC) EliteBook 820 G3 (L4Q17AV) EliteBook 820 G3 (W0W28UP) EliteBook 725 G3 (T5L20PA) EliteBook 725 G3 (L8K49AV) EliteBook 820 G3 (W4R01UC) EliteBook 725 G3 (V0R60EC) EliteBook 725 G3 (P4T48EA) EliteBook 820 G3 (W4Z03AW) EliteBook 725 G3 (V6B74UC) EliteBook 725 G3 (T1C17UT) EliteBook 820 G3 (W5P16UP) EliteBook 725 G3 (W0W85UP) EliteBook 820 G3 (L4Q15AV) EliteBook 820 G3 (W8F07UP) EliteBook 725 G3 (W5P23UP) Elitebook 820 G3 (T9X40ET) EliteBook 820 G3 (X4A65UC) EliteBook 725 G3 (X1W36UP)

Replaces Part Numbers

SN03XL HSTNN-L42C HSTNN-I42C HSTNN-DB6V HSTNN-UB6T SN03044XL T7B33AA 800232-241 800232-271 800232-541 800514-001

Technical Specifications

Voltage11.4V
Amp Hours3700mAh
Capacity3700mAh
Rate42.18Wh
Net Weight214g /7.55 oz
Gross Weight354g /12.49 oz
Approximate Weight354g /12.49 oz
Dimension 160.20 x 127.40 x 8.00mm

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

The HP BIOS is showing a "battery not detected" or 0% message right after I fitted the new SN03XL — did I get a dead cell?

Almost certainly not a dead cell. The EliteBook BIOS reads authentication data from the battery's EEPROM on first contact, and if the handshake sequence is interrupted during seating, the firmware can return a false "not detected" state. Power the laptop off completely, reseat the battery connector firmly until it clicks, then boot without the AC adapter connected. If the BIOS still returns 0%, connect the charger and wait two minutes before booting — the BMS needs a small charge input to wake the protection circuit from deep-sleep lockout.

The OS fuel gauge is jumping around wildly — showing 60%, then 45%, then back to 70% within minutes on the EliteBook 820 G3. What is going on?

The fuel gauge IC inside the EliteBook calibrates its voltage-to-capacity curve against actual cell behaviour over several cycles. A fresh cell has different impedance characteristics than the degraded one it replaced, so the IC's stored curve no longer matches reality. This mismatch produces erratic percentage readings for the first few charge-discharge cycles. Run three complete cycles — discharge to hibernate-cutoff, then charge uninterrupted to 100% — and the gauge IC will re-map its curve against the new cell's actual discharge profile.

My EliteBook 820 G3 stops charging at 80% and will not go higher, even with the new battery fitted. Is the replacement cell faulty?

This is a BIOS firmware setting, not a cell fault. HP ships many EliteBook units with Battery Health Manager enabled in the BIOS, which caps charge at 80% to reduce long-term cell wear. The replacement cell has no control over this limit. Go to BIOS Setup (F10 at boot), navigate to Power Management, find Battery Health Manager, and set it to "Let HP manage my battery charging" or "Maximize my battery performance" — the cap will lift and the cell will charge to 100V full capacity.

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