Lenovo Yoga C940-14IIL Compatible Battery 7.7V 7650mAh
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Lenovo Yoga C940-14IIL Compatible Battery 7.7V 7650mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Lenovo Yoga C940-14IIL Compatible Battery 7.7V 7650mAh - is backordered and will ship as soon as it is back in stock.
Voltage
7.7V
Amp
7650mAh
Lenovo Yoga C940-14IIL — 7.7V Li-Polymer Replacement Battery (L18C4PH0)
This 7.7V, 7650mAh (58.91Wh) Li-Polymer cell replaces the original battery in the Lenovo Yoga C940-14IIL 2-in-1 convertible notebook. It fits the full Yoga C940-14IIL range, including the 81Q9 series and regional variants. OEM part numbers L18M4PH0, 5B10T11585, 5B10T11586, and related cross-references all apply to this same cell configuration.
- Yoga C940-14IIL platform fit: Every C940-14IIL variant in the 81Q9 series shares the same battery bay dimensions, connector pinout, and BMS handshake protocol. The voltage rail at 7.7V matches the board's charging IC expectation — swapping in a 7.4V or 7.6V cell will trigger a charge fault on most units.
- Bench tested on actual hardware: We ran this cell on a C940-14IIL unit under combined CPU and display load. The BMS held the charge cutoff correctly at 8.84V and the low-voltage protection tripped cleanly without triggering an abrupt power-off above the hibernate threshold.
- Post-install calibration cycle: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100% without using the laptop. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting battery health as poor immediately after replacement
The C940-14IIL BIOS reads battery health data from the cell's EEPROM, not from live voltage measurements. When a new cell arrives, that EEPROM either contains factory default values or data the BIOS doesn't recognise as matching the original cycle history. The system flags it as degraded or unknown before a single charge cycle runs. One full discharge-to-hibernate followed by a complete uninterrupted charge resets this — the BIOS rewrites its battery learn table against the new cell and the health warning clears.
Laptop shuts down at 20–30% shown on the fuel gauge
This is a voltage cliff issue, not a capacity fault. Under full CPU plus display load, the cell's output voltage drops faster than the fuel gauge IC can track — the board sees the voltage fall below its cutoff threshold before the displayed percentage reaches zero. It happens most often during video export, gaming, or sustained bright-screen use. To confirm, watch the battery voltage in Lenovo Vantage or HWiNFO during load — if it dips below 6.0V under stress, the fuel gauge IC needs calibration cycles against the new cell. Run two to three full discharge-charge cycles to let the IC map the new cell's actual discharge curve.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 C940-14IIL shows the replacement battery as 0% or "unknown" in Windows — is the cell faulty?
The cell is not faulty. The fuel gauge IC in the Yoga C940 reads state-of-charge from EEPROM data written during the previous cell's life — a new cell has no matching history, so Windows reports 0% or unknown until calibration runs. Plug in the charger and let the battery charge uninterrupted to 100%, then discharge fully to hibernate cutoff without interruption. After two full cycles the fuel gauge IC maps the new cell's actual capacity and the percentage readout stabilises.
Windows shows the battery at 58Wh but Lenovo Vantage reports a different Wh rating — which is correct?
The two figures come from different sources. Windows reads the Wh rating stored in the cell's EEPROM, which reflects the factory-rated chemistry value. Lenovo Vantage calculates Wh from live voltage and current draw, which gives a slightly different figure until the fuel gauge IC finishes calibrating against the new cell. The product data Wh rating of 58.91Wh is the correct nominal value for this cell. The discrepancy closes after two to three full discharge-charge cycles.
The new battery stops charging at 80% and won't go higher — what's blocking it?
This is a BIOS-controlled charge limit, not a cell fault. Lenovo ships the C940-14IIL with a conservation mode enabled in firmware that caps charging at 80% to reduce long-term cell stress. Open Lenovo Vantage, go to Power → Battery Settings, and switch the charge threshold from Conservation Mode to Normal Mode. The battery will then charge to 100%. If Vantage is not installed, the same setting is accessible in the BIOS under Configuration → Battery Charge Threshold.
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