Lenovo Yoga C940-14IIL Compatible Battery 7.7V 7650mAh
Check that your old battery model number and device model to match our description. This makes sure they work together.
We ship your order same day if you buy it before 4 PM EST.
Lenovo Yoga C940-14IIL Compatible Battery 7.7V 7650mAh - is backordered and will ship as soon as it is back in stock.
Let customers speak for us
Send Your Battery Photo
Expert Technician Help
Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.
POST YOUR BATTERY IMAGE
Product & Solutions Expert
✉ sales@batteryweb.com
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 / 5B10T11585)
This 7.7V, 7650mAh (58.91Wh) lithium-polymer battery is a direct cell replacement for the Lenovo Yoga C940-14IIL convertible ultrabook. It covers the full C940-14IIL lineup, including the 81Q9 series and regional variants. OEM part numbers include L18C4PH0, L18M4PH0, 5B10T11585, 5B10T11586, 5B10T11686, 5B10W67180, 5B10W67374, SB10W67323, and SB10W67416.
- C940-14IIL series coverage: The entire 81Q9 model range shares the same battery bay dimensions, connector pinout, and BMS communication protocol. Voltage rail and physical footprint are identical across all regional SKUs, so one cell fits the full lineup without modification.
- Bench tested on actual hardware: We ran this cell on the C940-14IIL under combined CPU and display load. The BMS held the 7.7V rail steady through charge and discharge cycles, and the protection circuitry triggered correctly at both low-voltage cutoff and overcharge thresholds.
- Post-swap calibration on the C940-14IIL: After fitting this cell, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell replacement on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The Lenovo BIOS reads health data from EEPROM embedded in the battery's BMS. When you swap cells, the EEPROM carries capacity and cycle data from the new cell, but the BIOS compares it against the charge history it stored for the old cell. This mismatch triggers a false "poor health" or "replace battery" warning even when the new cell is in full working order. Running one complete discharge-to-hibernate followed by an uninterrupted full charge allows the BIOS learn cycle to rewrite its baseline against the new cell. After two or three full cycles, the health indicator normalises.
Yoga C940-14IIL shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC hasn't completed calibration against the new cell yet. The gauge's charge map still reflects the old cell's voltage curve, so it reports 25% while the actual cell voltage has already dropped below the safe operating floor under full CPU and display load. The laptop's hardware protection circuit then forces an abrupt shutdown before the OS can initiate a clean hibernate. To fix it, run two full discharge-to-hibernate and full-charge cycles without interruption — by the end of the second cycle, the fuel gauge IC has rebuilt its map against the new cell and reported percentage will track actual voltage accurately. Confirm the cell is recovering fully by checking Lenovo Vantage, which should show the cell voltage climbing above 7.6V during the final charge phase.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Lenovo
- Manufacturer: CS
- Color: Black
- Product Type: Li-Polymer
- Battery Type: Li-Polymer
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Yoga C940-14IIL shows "0% available (plugged in, not charging)" right after fitting the new battery — what's wrong?
The BIOS has lost its handshake with the new cell's BMS and is reporting no recognised battery. Shut down completely — not restart — unplug the charger, hold the power button for 15 seconds to drain residual capacitor charge, then reconnect the charger and power on. If the problem persists, enter the BIOS at boot and check whether the battery appears under the power menu; if it does, the OS fuel gauge driver needs a cold reboot cycle to re-initialise against the new cell's EEPROM data.
Lenovo Vantage is showing the wrong Wh rating — 57Wh instead of 58.91Wh — after I installed this battery. Is the cell faulty?
This is not a fault. Vantage reads the Wh figure from the battery's EEPROM, which stores a rated design capacity that can differ slightly from the actual measured capacity of the new cell chemistry. The 58.91Wh figure in the product data is the real measured value; the EEPROM-reported number reflects the OEM's rated spec entry for that part number. No action is needed — the cell is delivering its full capacity regardless of what Vantage displays in the info panel.
The new battery on my C940-14IIL stops charging at 80% and won't go higher — is this a battery problem?
This is a BIOS-controlled charge limit, not a cell fault. Lenovo Vantage includes a "Conservation Mode" setting that caps charging at 80% to reduce long-term cell stress during periods of regular AC use. Open Lenovo Vantage, go to Power, select Battery Settings, and switch from Conservation Mode to Normal Mode. The battery will then charge to 100% on the next cycle.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Related Products
Engineered for Performance. Built to Last.
Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.
-
Sold outUp to 20% off
BatteryWeb
Kosnic KBAT2200 7.2V Emergency Light Compatible Battery 2600mAh
0.28 lb
Sale priceFrom $43.99 USD Regular price $54.99Unit price -
-
Sold outUp to 20% off
BatteryWeb
Kosnic BAT26LI1 Replacement Battery 3.7V 2600mAh
0.17 lb
Sale priceFrom $43.99 USD Regular price $54.99Unit price -
-
Sold outUp to 20% off
BatteryWeb
Harman/Kardon Onyx Studio 9 I0709A Replacement Battery 3.7V
0.22 lb
Sale priceFrom $46.99 USD Regular price $57.99Unit price -
-
Sold outUp to 20% off
BatteryWeb
Yamaha KCA-M53G0-10 PLC Replacement Battery 3.6V 3600mAh
0.11 lb
Sale priceFrom $43.99 USD Regular price $54.99Unit price -
-
Sold outUp to 20% off
BatteryWeb
Kobo Clara HD N249 Replacement Battery 3.7V 1200mAh
0.17 lb
Sale priceFrom $39.99 USD Regular price $49.99Unit price -
-
Sold outUp to 19% off
BatteryWeb
Bosch 18V 3400mAh Cordless Vacuum Replacement Battery 908BPV180
0.75 lb
Sale priceFrom $93.99 USD Regular price $115.99Unit price -
-
Sold outUp to 19% off
BatteryWeb
Bosch BBH3PETGB/01 Replacement Battery 25.2V 3400mAh
1.19 lb
Sale priceFrom $81.99 USD Regular price $100.99Unit price -
-
Sold outUp to 19% off
BatteryWeb
Bosch 828BPV252 25.2V Cordless Vacuum Compatible Battery 2600mAh
1.17 lb
Sale priceFrom $68.99 USD Regular price $84.99Unit price -
