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L18L3PF6 Lenovo IdeaPad S540 Compatible Battery 11.34V 4500mAh

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From $71.99 USD $88.99
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Fits Lenovo IdeaPad S540-15IWL GTX and IdeaPad S540-15IWL; replaces OEM part L18L3PF6, SB10W67224, 5B10T26389, 5B10W67284.
11.34V, 4500mAh Li-Polymer cell matches the original pack voltage and capacity for full system performance.
Connector seats flush into the battery bay latch; verify the contact pins align before closing the retention clip.
We bench-tested the BMS handshake on cold insertion—fuel gauge IC accepted the new cell without error codes on boot.
After installation, run one full discharge to hibernation cutoff then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear inaccurate 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.

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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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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.

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🔹 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

11.34V

Amp

4500mAh

Lenovo IdeaPad S540-15IWL GTX — 11.34V Li-Polymer Replacement Battery (L18L3PF6)

This is an 11.34V, 4500mAh (51.03Wh) Li-Polymer replacement battery for the Lenovo IdeaPad S540-15IWL GTX and IdeaPad S540-15IWL laptops. It replaces OEM part numbers L18L3PF6, SB10W67224, 5B10T26389, and 5B10W67284. If the original cell has degraded or fails to hold charge, this swap restores cordless use.

  • IdeaPad S540-15IWL and GTX variant: Both the standard S540-15IWL and the GTX variant share the same battery bay dimensions, connector pinout, and BMS handshake protocol — the GTX label indicates the discrete GPU configuration, not a different battery platform.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the S540 platform. The BMS communicated correctly with the EC firmware, reported capacity data to the OS, and held stable voltage across the full discharge curve without triggering a protection cutoff.
  • Post-install learn cycle on S540: After fitting, run the battery down until the laptop hibernates, then charge uninterrupted to 100% without using the machine. This gives the BIOS fuel gauge IC one complete reference cycle against the new cell and clears the inaccurate health warning that appears after every cell swap on IdeaPad firmware.

BIOS reporting poor battery health immediately after replacement

The S540 BIOS reads health data stored in the battery's EEPROM and compares it against accumulated cycle history from the previous cell. A new cell presents fresh EEPROM data with zero cycles, which the firmware initially interprets as a mismatch rather than a clean slate. This triggers the "poor health" or "replace battery" flag in Lenovo Vantage or the BIOS setup screen. One full discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle — run it twice if the warning persists after the first cycle.

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

This happens when the fuel gauge IC's stored discharge curve no longer matches the new cell's actual voltage-versus-capacity profile. The OS believes 25% remains, but the cell voltage has already dropped below the BMS cutoff threshold under the combined load of the CPU, display, and GPU — so the system shuts down without warning. The fix is calibration: let the battery discharge fully to hibernate cutoff, then charge to 100% with the laptop off or in sleep mode. After two or three cycles the fuel gauge recalibrates to the new cell and the shutdown at 20–30% stops.

Compatible Models

Ideapad S540-15IWL GTX Ideapad S540-15IWL

Replaces Part Numbers

L18L3PF6 SB10W67224 5B10T26389 5B10W67284

Technical Specifications

Voltage11.34V
Amp Hours4500mAh
Capacity4500mAh
Rate51.03Wh
Net Weight216.2g /7.63 oz
Gross Weight356.2g /12.56 oz
Approximate Weight356.2g /12.56 oz
Dimension 207.70 x 123.14 x 6.30mm

Product Highlights

  • Brand: Lenovo
  • 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

Lenovo Vantage is showing the new battery as "0% available (plugged in, not charging)" — what's actually wrong?

The EC firmware on the S540 sometimes loses handshake with the new cell's BMS on first boot and locks the charge circuit as a protection response. Shut the laptop down fully, remove the AC adapter for 60 seconds, reconnect AC without the battery, boot to the BIOS setup screen, then shut down again and refit the battery. On the next boot the EC re-initialises the BMS connection and Vantage should show a normal charge state.

Windows is reporting the battery capacity as 38Wh when the cell is rated 51.03Wh — is the cell faulty?

The Wh figure Windows reports is pulled from the EEPROM on the battery, which stores the rated design capacity of the original OEM cell. After a cell swap, the EEPROM data and the actual chemistry of the new cell can differ until the fuel gauge IC has logged at least one full calibration cycle. Run a full discharge to hibernate cutoff, then charge uninterrupted to 100%. After one to two cycles the reported Wh figure stabilises against the real cell capacity.

Charge stopped at 80% and won't go higher — is the new battery defective?

This is a BIOS-controlled charge limit, not a fault in the cell. Lenovo IdeaPad firmware includes a "Conservation Mode" in Lenovo Vantage that caps charging at 60% or 80% to reduce cell stress during extended AC use. Open Lenovo Vantage, navigate to Power, and check Battery Charge Threshold or Conservation Mode — switch it off. The battery will then charge to 100% on the next cycle.

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Lenovo Ideapad S540-15IWL GTX Replacement Battery, 11.34V, 4500mAh, Li-Polymer 1

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