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Lenovo Legion Y740S L19M4PG0 Replacement Battery 15.36V 59.9Wh

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From $102.99 USD $123.99
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Fits Lenovo Legion Y740S, Y740S-15IMH, Y9000X; replaces L19M4PG0, SB10V26975, 5B10V26973, 5B10W67240, L19C4PG0, SB10V26972, 5B10W67169, SB10W67233.
This 15.36V, 3900mAh Li-Polymer cell delivers 59.9Wh for sustained gaming and workload performance on the Legion Y740S platform.
Connector type is Lenovo proprietary; slot orientation keyed to prevent reverse insertion; locking tab seats flush with chassis frame.
We bench-tested this cell against stock Y740S hardware; BMS accepted the new pack on first insertion with clean voltage handshake and no fault codes.
After installation, run one full discharge to hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears 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.

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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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

15.36V

Amp

3900mAh

Lenovo Legion Y740S / Y9000X — 15.36V Li-Polymer Replacement Battery (L19M4PG0)

This is a 15.36V, 3900mAh (59.9Wh) Li-Polymer battery for the Lenovo Legion Y740S, Legion Y740S-15IMH, and Legion Y9000X gaming notebooks. It replaces OEM part numbers L19M4PG0, L19C4PG0, SB10V26975, SB10V26972, 5B10V26973, 5B10W67240, 5B10W67169, and SB10W67233. The slim 4.54mm cell profile is specific to the Y740S and Y9000X chassis.

  • Y740S and Y9000X fitment: Both models share the same internal battery bay dimensions, connector pinout, and BMS handshake protocol — which is why they draw from the same OEM part range. The 15.36V four-cell configuration matches the voltage rail these boards expect. Fitting a mismatched voltage cell will cause the BIOS to reject the pack entirely.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Legion Y740S unit. The BMS communicated correctly over the SMBus interface, the BIOS recognised the pack without error, and the fuel gauge initialised from the first boot.
  • Post-install calibration on Lenovo gaming notebooks: After fitting, run a full discharge to hibernate cutoff then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health warning that appears after every cell swap on Lenovo Legion firmware.

BIOS reporting poor battery health immediately after fitting a new cell

The Legion BIOS reads health data from the battery's EEPROM on first contact. When a new cell arrives, that EEPROM holds default factory values that the firmware interprets as degraded capacity relative to rated spec. This is not a fault with the cell — it is a mismatch between stored EEPROM data and the BIOS learn cycle baseline. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%, and the firmware recalculates health against the actual cell. After that cycle the health indicator should read above 95%.

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

This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The gauge maps a percentage to a voltage reading — if that mapping is still set to the old cell's curve, the percentage shown at shutdown can be well above zero. Under full CPU and display load, the cell voltage drops faster than the uncalibrated gauge expects, and the BMS triggers an emergency cutoff before the displayed percentage reaches the threshold. Complete two or three full charge and discharge cycles to let the gauge IC re-map the curve. After calibration, the cutoff will align with the actual cell voltage floor near 12.0V.

Compatible Models

Legion Y740S Legion Y740S-15IMH Legion Y9000X

Replaces Part Numbers

L19M4PG0 SB10V26975 5B10V26973 5B10W67240 L19C4PG0 SB10V26972 5B10W67169 SB10W67233

Technical Specifications

Voltage15.36V
Amp Hours3900mAh
Capacity3900mAh
Rate59.9Wh
Net Weight244.4g /8.62 oz
Gross Weight504.4g /17.79 oz
Approximate Weight504.4g /17.79 oz
Dimension 293.78 x 107.75 x 4.54mm

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

My Legion Y740S shows the replacement battery as "0% available (plugged in, not charging)" in Windows — what is happening?

The Windows fuel gauge IC is reading EEPROM data from the new cell that does not yet match the expected charge state. The battery is not faulty — the gauge has not completed its first calibration pass. Unplug the adapter, let the laptop discharge fully to hibernate, then plug in and charge uninterrupted to 100% without interruption. After that full cycle, the fuel gauge re-initialises and the percentage reads correctly.

System information shows this battery as 45Wh but the spec is 59.9Wh — is the cell underspec?

The Wh figure Windows reports is pulled from the EEPROM's "design capacity" field, which can differ from the actual chemistry capacity until the BIOS learn cycle completes. The physical cell is rated 59.9Wh as confirmed at the factory. Run one full discharge-to-hibernate and charge-to-100% cycle — after that the BIOS recalculates full charge capacity against the measured cell and the reported Wh figure updates to reflect the actual rating.

The charge stops at 80% and will not go higher — is the new battery defective?

This is a BIOS-controlled charge limit, not a battery fault. Lenovo Legion firmware includes a "Conservation Mode" setting that caps charging at 60% or 80% to reduce cell stress during long periods on AC power. Check Lenovo Vantage under Power → Battery Charge Threshold and confirm Conservation Mode is off. Once disabled, the battery will charge to 100% on the next charge cycle.

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