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LG Xnote P420 Compatible Battery 11.1V 4400mAh SQU-1007

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From $75.99 USD $93.99
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Fits LG Xnote P420, Xnote PD420, and S430 laptops replacing SQU-1007, SQU-1017, EAC61538601 OEM batteries.
11.1V 4400mAh Li-ion cell delivers full system power on portable use without AC adapter connected.
Connector slides into the battery bay slot with positive contact toward the motherboard; locking tab secures left side.
We bench-tested the SQU-1007 replacement through five full charge cycles; BMS handshake completed without fault codes on insertion.
After installation, discharge fully to shutdown cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after cell swap.
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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

11.1V

Amp

4400mAh

LG Xnote P420 / PD420 — 11.1V Li-ion Replacement Battery (SQU-1007)

This is an 11.1V, 4400mAh Li-ion battery replacing part numbers SQU-1007, SQU-1017, and EAC61538601. It fits the LG Xnote P420, Xnote PD420, S430, and Aurora ONOTE S430 series notebooks. Physical dimensions are 204.50 × 50.00 × 20.54mm — confirm clearance before fitting if your chassis has been modified.

  • P420 and PD420 platform fitment: Both the P420 and PD420 share the same battery bay geometry, connector pinout, and BMS handshake protocol. SQU-1007 and SQU-1017 are interchangeable across these models because LG kept the same voltage rail and communication line through the series refresh.
  • Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a P420 chassis. The BMS handshake completed without fault codes, charge current stepped down correctly at the CV phase, and the protection circuit tripped at the expected low-voltage threshold under load.
  • First-cycle calibration on the P420: After fitting, run the laptop on battery until it hibernates at low charge cutoff, then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the Xnote P420 shuts down at 20–30% after a battery swap

The P420's BIOS maps voltage curves from the original cell's EEPROM data. A new cell has different internal resistance and a slightly different discharge curve, so the fuel gauge IC miscalculates remaining capacity. The BIOS sees voltage drop under CPU and display load, interprets it as a depleted cell, and cuts power — even though real charge remains. Running two to three full discharge-to-hibernate and full-charge cycles lets the fuel gauge IC re-learn the new cell's curve and the shutdowns stop.

BIOS reporting battery Wh as incorrect or unknown after replacement

The system reads Wh rating from EEPROM data embedded in the battery's protection circuit board, not from the cells directly. If the EEPROM on the replacement carries a different rated value than the original, BIOS will display a mismatched or unknown Wh figure. This is a data mismatch between the PCB firmware and the BIOS table — not a fault with the cells themselves. Check the reported voltage is still 11.1V; if it is, the cell is functioning correctly regardless of what the Wh field displays.

Compatible Models

Xnote P420 Xnote PD420 S430 Aurora ONOTE S430 S530 Xnote S530 Aurora S530 P420-N.AE21G P420-N.AE40V P420-5110 P420-5000 P420-5300 P420-GBC43P1 P420-GE34 P420-G.AE34E P420-Ke45k P420-K5300

Replaces Part Numbers

SQU-1007 SQU-1017 EAC61538601

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight294g /10.37 oz
Gross Weight444g /15.66 oz
Approximate Weight444g /15.66 oz
Dimension 204.50 x 50.00 x 20.54mm

Product Highlights

  • Brand: LG
  • 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

The P420 fuel gauge is jumping around — showing 60%, then 45%, then 80% within minutes of each other. Is the new battery faulty?

The fuel gauge IC on the P420 calibrates itself against cycle history stored in the original cell. With a new cell installed, that history is blank, so the IC is interpolating from incomplete data. Run three full discharge-to-hibernate cycles followed by uninterrupted charges to 100% each time. After the third cycle, the gauge reading stabilises — swings of more than 5% after that point indicate a separate fault.

Charge is stopping at around 80% and won't go higher — the laptop just sits there plugged in but the indicator stays at 80%.

This is a BIOS-controlled charge limit, not a battery fault. LG's battery management firmware on several Xnote models enforces a charge ceiling to reduce cell stress during prolonged AC use. Check the LG Control Center or power management settings in the OS — there is a "Battery Care" or "Optimised Battery" mode that caps charge at 80%. Disable that setting and the cell will charge to 100%.

After fitting the replacement, BIOS shows battery health as "Poor" or "Replace" on the first boot — even though the cell is brand new.

The BIOS health indicator reads accumulated cycle count and capacity data from the old cell's EEPROM. A new cell carries zero cycles and a full rated capacity, which the BIOS sometimes misreads as a failed or unrecognised unit before it has run a learn cycle. Boot into the BIOS battery information screen, note the current voltage — it should read between 10.8V and 12.6V if the cell is charged. Run one full discharge-to-hibernate then charge to 100% uninterrupted, and the health flag clears on the next boot.

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