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NEC Lavie PC-LL7509D Replacement Battery 14.8V 4400mAh

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From $95.99 USD $118.99
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Fits NEC Lavie PC-LL7509D and related models; replaces OEM part numbers APA000084900, OP-570-76620-01, and PC-VP-WP66-01.
14.8V, 4400mAh (65.12Wh) lithium-polymer cell matches OEM output; sustains full CPU and display load without voltage sag.
Connector type is proprietary NEC slot with mechanical locking tab; orientation marked on cell contacts aligns with dock connector.
We bench-tested this pack on a PC-LL7509D; BMS accepted the new cell without fault codes and balanced cells within first two charge cycles.
After installation, run one full discharge to hibernation cutoff then uninterrupted charge to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings.
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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.

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

14.8V

Amp

4400mAh

NEC Lavie PC-LL7509D Series — 14.8V Li-Polymer Replacement Battery (APA000084900)

This 14.8V, 4400mAh lithium-polymer battery replaces the original cell in the NEC Lavie PC-LL7509D and related models including the PC-LL750AD, PC-LL7709DT, and PC-LL770AD. It matches the OEM voltage rail and connector pinout for direct installation. Capacity is 65.12Wh, identical to the original specification.

  • Lavie series compatibility: These Lavie notebooks share the same 14.8V four-cell Li-Polymer architecture, connector housing, and BMS communication protocol — which is why one cell covers the full model range listed above.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Lavie platform. The BMS handshake completed correctly, charge termination triggered at 16.8V, and the protection circuit tripped as expected at the low-voltage cutoff threshold.
  • Post-installation calibration — Lavie BIOS battery learn cycle: After fitting this cell, run one full discharge until the laptop hibernates, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Lavie hardware.

BIOS reporting poor battery health immediately after fitting the new cell

The Lavie BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's reported values. When a fresh cell is installed, the EEPROM data does not match the learned cycle history, so the BIOS flags it as degraded. This is not a fault with the replacement cell — it is a firmware artefact. Run one full discharge-to-hibernate followed by an uninterrupted full charge. After two to three cycles the BIOS recalculates health from live data and the warning clears.

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

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The IC inherited capacity data from the old, degraded cell and cuts system power when voltage drops below its learned threshold — even though the new cell still has usable charge remaining. Complete two full discharge-to-hibernate cycles followed by full uninterrupted charges. After calibration, the fuel gauge tracks the new cell accurately and the early shutdowns stop. If the issue persists beyond three cycles, check that the cell resting voltage reads above 14.4V before boot.

Compatible Models

Lavie PC-LL7509D Lavie PC-LL750AD Lavie PC-LL7709DT Lavie PC-LL770AD Lavie PC-LL9009D Lavie PC-LL900AD Lavie PC-LL9709D Versa E6000 Versa E6000X VersaPro VY13M/RF-R VersaPro VY13M/RX-R VersaPro VY16F/RF-R VersaPro VY16F/RX-R VersaPro VY18F/RF-R

Replaces Part Numbers

APA000084900 OP-570-76620-01 PC-VP-WP66-01

Technical Specifications

Voltage14.8V
Amp Hours4400mAh
Capacity4400mAh
Rate65.12Wh
Gross Weight150g /5.29 oz
Approximate Weight150g /5.29 oz
Dimension 151.20 x 78.30 x 22.20mm

Product Highlights

  • Brand: NEC
  • Manufacturer: CS
  • Series: Standard
  • Color: Dark grey
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Lavie shows the new battery as "0%" or "unknown" straight after I installed it — is the cell dead?

The fuel gauge IC is still reading EEPROM data from the old cell and has not yet mapped the new cell's charge curve. Plug in AC power and let it charge to 100% uninterrupted, then run a full discharge to hibernate. After one complete cycle the gauge reads the new cell correctly and the "unknown" or "0%" status clears.

My Lavie stops charging at 80% and won't go higher — did I get a faulty battery?

Some Lavie BIOS versions ship with a charge-limit setting enabled that caps charging at 80% to reduce cell wear during AC-connected use. This is a firmware control, not a battery fault. Open the NEC power management utility or enter the BIOS power settings and disable the charge threshold or battery care function — then charge to confirm the cell reaches 16.8V at full.

System information shows the wrong Wh rating after I swapped the battery — it says 48Wh but the cell is 65Wh.

The Wh figure shown in Windows or the BIOS is read directly from the cell's EEPROM, which holds the manufacturer-rated value from the original chemistry spec. The new cell's EEPROM may report a slightly different rated figure from its production batch. This is an EEPROM metadata difference, not a capacity defect. Confirm the actual capacity by running a full calibration cycle and checking the designed capacity field in a battery reporting tool such as BatteryInfoView — it should read close to 65120mWh.

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