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Lenovo Yoga C740 Replacement Battery 11.52V 5050mAh

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From $107.99 USD $129.99
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Fits Lenovo Yoga C740, Yoga C740-15IML, and YOGA C740-15 laptops; replaces OEM part numbers 5B10T83739, 5B10T83740, L18M3PFA, and L18D3PF2.
11.52V at 5050mAh delivers 58.18Wh — matches the original capacity needed for full-day operation on this convertible without throttling.
Connector slides straight into the battery slot with a single locking tab on the right edge; no force required on insertion or removal.
We bench-tested the cell across three full discharge-to-shutdown cycles; the BMS held voltage stable until cutoff, with no early termination or thermal drift.
After installation, run one complete discharge down to hibernation 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 on Lenovo platforms.
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.

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

11.52V

Amp

5050mAh

Lenovo Yoga C740-15IML — 11.52V Li-Polymer Replacement Battery (5B10T83739)

This is an 11.52V, 5050mAh (58.18Wh) Li-Polymer battery for the Lenovo Yoga C740 2-in-1 convertible laptop series. It fits the Yoga C740, Yoga C740-15IML, and Yoga C740-15 models. OEM part numbers covered include 5B10T83739, 5B10T83740, L18M3PFA, and L18D3PF2.

  • Yoga C740 series fit: The C740, C740-15IML, and C740-15 all share the same 11.52V three-cell Li-Polymer configuration, physical connector, and BMS handshake protocol. Swapping between these variants requires no adapter or wiring change.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a C740-15IML. The BMS negotiated correctly with the EC firmware — no error flags, no charge interruption, and the fuel gauge IC registered capacity within expected tolerance after two calibration cycles.
  • Post-install calibration on the C740: After fitting, discharge the laptop fully until it hibernates at low battery cutoff, then charge uninterrupted to 100% without using the machine. This forces the BIOS battery learn cycle to reset against the new cell and clears the false "poor health" warning that appears in Lenovo Vantage after every cell swap.

BIOS reporting battery health as poor after replacement on the C740

The Yoga C740's embedded controller stores charge history and health metrics tied to the original cell's EEPROM data. When a new cell is installed, that stored data no longer matches the new chemistry, so the BIOS flags it as degraded. This is not a fault with the replacement — it is a calibration mismatch. Running one full discharge-to-hibernate followed by an uninterrupted full charge resets the learn cycle. After two to three cycles, Lenovo Vantage should report health accurately.

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

This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. The percentage shown on screen no longer maps to real cell voltage, so the laptop hits voltage cliff before the OS expects it. The EC triggers an immediate shutdown to protect the board — it is not a fault in the new cell. Discharge fully to hibernate cutoff, then charge to 100% uninterrupted twice in a row to recalibrate the fuel gauge against the new cell's actual voltage curve. After that, the displayed percentage should track correctly down to approximately 3.2V per cell before cutoff.

Compatible Models

Yoga C740 Yoga C740-15IML YOGA C740-15

Replaces Part Numbers

5B10T83739 5B10T83740 L18M3PFA L18D3PF2

Technical Specifications

Voltage11.52V
Amp Hours5050mAh
Capacity5050mAh
Rate58.18Wh
Net Weight243g /8.57 oz
Gross Weight503g /17.74 oz
Approximate Weight503g /17.74 oz
Dimension 311.80 x 152.60 x 4.20mm

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 shows the new battery as "Unknown" or 0% — is the cell dead out of the box?

No — the C740's embedded controller reads EEPROM data from the original cell and does not immediately recognise a replacement. The "Unknown" or 0% reading is a BMS initialisation state, not a hardware fault. Connect the charger and leave the laptop plugged in for at least 30 minutes before booting. If the reading persists after one full charge cycle, run a discharge-to-hibernate then charge uninterrupted to 100% to complete the battery learn cycle.

Why does the system info show a different Wh rating than the 58.18Wh listed for this battery?

The Wh figure shown in Windows or Lenovo Vantage is pulled from the EEPROM on the cell itself, which stores the rated design capacity. The displayed number may differ slightly from the actual measured capacity depending on cell lot and how the firmware rounds the value. This is an EEPROM reporting difference, not a sign the wrong battery was shipped. Check that the OEM part number — 5B10T83739, 5B10T83740, L18M3PFA, or L18D3PF2 — matches what is printed on the cell label to confirm correct fitment.

Charging stops at 80% and will not go higher — is the battery faulty?

This is almost always the BIOS-controlled charge threshold in Lenovo Vantage, not a battery fault. Lenovo ships the C740 with a "Conservation Mode" setting enabled by default that caps charging at 80% to reduce long-term cell wear. Open Lenovo Vantage, go to Power → Battery Settings, and switch from Conservation Mode to Normal Mode. Charging will then proceed to 100%.

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