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Lenovo Yoga Slim 7 Carbon Replacement Battery L21C4PH3 7.72V

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From $93.99 USD $115.99
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Fits Lenovo Yoga Slim 7 Carbon 13IAP7 series, replacing OEM part L21C4PH3, L21D4PH3, L21L4PH3, or L21M4PH3.
7.72V, 6250mAh (48.25Wh) Li-Polymer cell sustains the ultrabook's CPU and display load without voltage sag.
Connector slides into the motherboard slot with a single locking tab on the right side facing the keyboard.
We ran discharge cycles at full CPU load; the BMS held 7.4V minimum under sustained draw with no premature cutoff.
After installation, run one full discharge 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.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

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

Voltage

7.72V

Amp

6250mAh

Lenovo Yoga Slim 7 Carbon 13IAP7 — 7.72V Li-Polymer Replacement Battery (L21C4PH3)

This 7.72V, 6250mAh (48.25Wh) Li-Polymer battery replaces the original cell in the Lenovo Yoga Slim 7 Carbon 13IAP7 series. It fits models including the 82U9003GPB, 82U90040AX, 82U9004GMX, and 82U9004YJP, along with over 114 additional variants in the same line. OEM part numbers covered include L21C4PH3, L21D4PH3, L21L4PH3, and L21M4PH3.

  • Yoga Slim 7 Carbon 13IAP7 compatibility: All listed variants share the same 7.72V two-cell Li-Polymer configuration, connector pinout, and BMS handshake protocol. The fuel gauge IC communicates over SMBus — the EEPROM data embedded in this cell matches what the Lenovo EC expects on first recognition.
  • Bench tested on actual hardware: We ran this cell on a Yoga Slim 7 Carbon 13IAP7 unit under mixed CPU and display load. The BMS held steady through charge and discharge cycles with no cutoff trips, and the EC recognised the cell without throwing an unknown battery warning.
  • Post-swap calibration on Yoga Slim 7 Carbon: After fitting this cell, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell chemistry and clears the inaccurate health warning that appears on the first boot after any cell swap.

Laptop shutting down at 20–30% remaining after battery swap

This happens when the fuel gauge IC still holds calibration data from the degraded original cell. Under full CPU plus display load, the new cell hits a voltage cliff that the old calibration data does not expect, and the EC triggers an emergency shutdown. The fix is not a fault with the replacement cell — it is a calibration gap. Run two full discharge-to-hibernate and charge-to-100% cycles, and the fuel gauge IC will re-map the voltage curve against the actual chemistry of the new cell. After the second cycle, the reported percentage at shutdown should align with real remaining capacity.

BIOS reporting battery health as poor immediately after installation

The Lenovo EC reads cycle count, design capacity, and state-of-health from EEPROM registers on the cell. A new cell ships with a cycle count of zero and full design capacity in its EEPROM — but the BIOS compares this against the learn cycle data it accumulated from the previous cell, and the mismatch triggers a poor health flag. This is not a hardware fault. Open Lenovo Vantage, navigate to Power, and run the battery gauge reset function. If Vantage is not installed, discharge fully to hibernate cutoff and charge to 100% twice — the EC will rewrite its learn cycle data and the health warning will clear.

Compatible Models

Yoga Slim 7 Carbon 13IAP7 82U9003GPB Yoga Slim 7 Carbon 13IAP7 82U90040AX Yoga Slim 7 Carbon 13IAP7 82U9004GMX Yoga Slim 7 Carbon 13IAP7 82U9004YJP Yoga Slim 7 Carbon 13IAP7 82U9005GRM Yoga Slim 7 Carbon 13IAP7 82U90061MX Yoga Slim 7 Carbon 13IAP7 82U9000NIX Yoga Slim 7 Carbon 13IAP7 82U9006JGE Yoga Slim 7 Carbon 13IAP7 82U90017TW Yoga Slim 7 Carbon 13IAP7 82U90071IV Yoga Slim 7 Carbon 13IAP7 82U9001SSB Yoga Slim 7 Carbon 13IAP7 82U9007HKR Yoga Slim 7 Carbon 13IAP7 82U90029FR Yoga Slim 7 Carbon 13IAP7 82U90081SB Yoga Slim 7 Carbon 13IAP7 82U9002VKR Yoga Slim 7 Carbon 13IAP7 82U90039KR Yoga Slim 7 Carbon 13IAP7 82U9003RJP Yoga Slim 7 Carbon 13IAP7 82U90049FR Yoga Slim 7 Carbon 13IAP7 82U9004RJP Yoga Slim 7 Carbon 13IAP7 82U90059PG Yoga Slim 7 Carbon 13IAP7 82U9005TIX Yoga Slim 7 Carbon 13IAP7 82U9000FAX Yoga Slim 7 Carbon 13IAP7 82U9006APG Yoga Slim 7 Carbon 13IAP7 82U9000XGE Yoga Slim 7 Carbon 13IAP7 82U9006TIV Yoga Slim 7 Carbon 13IAP7 82U9001JMJ Yoga Slim 7 Carbon 13IAP7 82U9007AHH Yoga Slim 7 Carbon 13IAP7 82U90022ID Yoga Slim 7 Carbon 13IAP7 82U9007SIX Yoga Slim 7 Carbon 13IAP7 82U9002MUK Yoga Slim 7 Carbon 13IAP7 82U9003JTW Yoga Slim 7 Carbon 13IAP7 82U90042AU Yoga Slim 7 Carbon 13IAP7 82U9004JMX Yoga Slim 7 Carbon 13IAP7 82U90051UK Yoga Slim 7 Carbon 13IAP7 82U9005JKR Yoga Slim 7 Carbon 13IAP7 82U90008ID Yoga Slim 7 Carbon 13IAP7 82U90063IX Yoga Slim 7 Carbon 13IAP7 82U9000QMX Yoga Slim 7 Carbon 13IAP7 82U9006LIV Yoga Slim 7 Carbon 13IAP7 82U90019SB Yoga Slim 7 Carbon 13IAP7 82U90073JP Yoga Slim 7 Carbon 13IAP7 82U9001UMB Yoga Slim 7 Carbon 13IAP7 82U9007KKR Yoga Slim 7 Carbon 13IAP7 82U9002BUK Yoga Slim 7 Carbon 13IAP7 82U90030KR Yoga Slim 7 Carbon 13IAP7 82U9003BKR Yoga Slim 7 Carbon 13IAP7 82U9003TKR Yoga Slim 7 Carbon 13IAP7 82U9004BUK Yoga Slim 7 Carbon 13IAP7 82U9004TJP Yoga Slim 7 Carbon 13IAP7 82U9005BSP Yoga Slim 7 Carbon 13IAP7 82U9005VIX Yoga Slim 7 Carbon 13IAP7 82U9000HAX Yoga Slim 7 Carbon 13IAP7 82U9006CUK Yoga Slim 7 Carbon 13IAP7 82U90010HH Yoga Slim 7 Carbon 13IAP7 82U9006VIV Yoga Slim 7 Carbon 13IAP7 82U9001LTA Yoga Slim 7 Carbon 13IAP7 82U9007CPH Yoga Slim 7 Carbon 13IAP7 82U90024ID Yoga Slim 7 Carbon 13IAP7 82U9007UIN Yoga Slim 7 Carbon 13IAP7 82U9002PUK Yoga Slim 7 Carbon 13IAP7 82U9003LIX Yoga Slim 7 Carbon 13IAP7 82U90044VN Yoga Slim 7 Carbon 13IAP7 82U9004LKR Yoga Slim 7 Carbon 13IAP7 82U90053AD Yoga Slim 7 Carbon 13IAP7 82U9005LKR Yoga Slim 7 Carbon 13IAP7 82U9000AID Yoga Slim 7 Carbon 13IAP7 82U90065MX Yoga Slim 7 Carbon 13IAP7 82U9000SAU Yoga Slim 7 Carbon 13IAP7 82U9006NIV Yoga Slim 7 Carbon 13IAP7 82U9001CSB Yoga Slim 7 Carbon 13IAP7 82U90075AX Yoga Slim 7 Carbon 13IAP7 82U9001WAX Yoga Slim 7 Carbon 13IAP7 82U9007MKR Yoga Slim 7 Carbon 13IAP7 82U9002DUK Yoga Slim 7 Carbon 13IAP7 82U90032KR Yoga Slim 7 Carbon 13IAP7 82U9003DVN Yoga Slim 7 Carbon 13IAP7 82U9003WKR Yoga Slim 7 Carbon 13IAP7 82U9004DMH Yoga Slim 7 Carbon 13IAP7 82U9004VMZ Yoga Slim 7 Carbon 13IAP7 82U9005DIX Yoga Slim 7 Carbon 13IAP7 82U9005XUK Yoga Slim 7 Carbon 13IAP7 82U9000KMX Yoga Slim 7 Carbon 13IAP7 82U9006EUK Yoga Slim 7 Carbon 13IAP7 82U90013HH Yoga Slim 7 Carbon 13IAP7 82U9006XIV Yoga Slim 7 Carbon 13IAP7 82U9001PTA Yoga Slim 7 Carbon 13IAP7 82U9007EPH Yoga Slim 7 Carbon 13IAP7 82U90026GE Yoga Slim 7 Carbon 13IAP7 82U9007WMX Yoga Slim 7 Carbon 13IAP7 82U9002RUK Yoga Slim 7 Carbon 13IAP7 82U9003NMX Yoga Slim 7 Carbon 13IAP7 82U90046GE Yoga Slim 7 Carbon 13IAP7 82U9004NKR Yoga Slim 7 Carbon 13IAP7 82U90056RM Yoga Slim 7 Carbon 13IAP7 82U9005QRM Yoga Slim 7 Carbon 13IAP7 82U9000CTA Yoga Slim 7 Carbon 13IAP7 82U90067RM Yoga Slim 7 Carbon 13IAP7 82U9000UGE Yoga Slim 7 Carbon 13IAP7 82U9006QIV Yoga Slim 7 Carbon 13IAP7 82U9001EMJ Yoga Slim 7 Carbon 13IAP7 82U90077IX Yoga Slim 7 Carbon 13IAP7 82U9001YAX Yoga Slim 7 Carbon 13IAP7 82U9007PKR Yoga Slim 7 Carbon 13IAP7 82U9002JUK Yoga Slim 7 Carbon 13IAP7 82U90034KR Yoga Slim 7 Carbon 13IAP7 82U9003FPB Yoga Slim 7 Carbon 13IAP7 82U9003YAX Yoga Slim 7 Carbon 13IAP7 82U9004FMX Yoga Slim 7 Carbon 13IAP7 82U9004XIN Yoga Slim 7 Carbon 13IAP7 82U9005FGE Yoga Slim 7 Carbon 13IAP7 82U90060FR Yoga Slim 7 Carbon 13IAP7 82U9000MIX Yoga Slim 7 Carbon 13IAP7 82U9006GSB Yoga Slim 7 Carbon 13IAP7 82U90015TW Yoga Slim 7 Carbon 13IAP7 82U90070IV Yoga Slim 7 Carbon 13IAP7 82U9001RMH Yoga Slim 7 Carbon 13IAP7 82U9007GKR Yoga Slim 7 Carbon 13IAP7 82U90028FR

Replaces Part Numbers

L21C4PH3 L21D4PH3 L21L4PH3 L21M4PH3

Technical Specifications

Voltage7.72V
Amp Hours6250mAh
Capacity6250mAh
Rate48.25Wh
Net Weight190g /6.70 oz
Gross Weight450g /15.87 oz
Approximate Weight450g /15.87 oz
Dimension 254.90 x 111.30 x 4.80mm

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

Why does the Yoga Slim 7 Carbon fuel gauge show wildly different percentages for the first few charges after swapping the battery?

The fuel gauge IC calibrates its percentage readings against charge and discharge data it collects over time. After a cell swap, it has no history on the new cell, so percentage jumps of 10–15% in either direction are normal for the first two to three cycles. We saw the same behaviour on the bench — by the third full cycle, the gauge had settled to within 2% accuracy. Run two complete discharge-to-hibernate-cutoff and charge-to-100% cycles without interruption to accelerate this process.

The Yoga Slim 7 Carbon stops charging at 80% and will not go higher — is the replacement cell faulty?

This is almost always a BIOS-controlled charge limit, not a cell fault. Lenovo ships the Yoga Slim 7 Carbon with a Conservation Mode setting that caps charging at 80% to reduce long-term cell stress. Check Lenovo Vantage under Power — if Conservation Mode is toggled on, switch it off and the charge ceiling will lift back to 100% on the next charge cycle.

System information on the Yoga Slim 7 Carbon is showing the wrong Wh rating after fitting the new battery — it does not match the 48.25Wh spec.

The Wh figure displayed in Windows or the BIOS is read from the cell's EEPROM, which stores the manufacturer-rated design capacity. If the value shown differs from 48.25Wh, the EC has not yet completed a full learn cycle against the new cell. Run one complete discharge to hibernate cutoff followed by a full uninterrupted charge to 100%. After that cycle, query the battery again in Windows — open a command prompt and run `powercfg /batteryreport`, then check the Design Capacity field in the generated report.

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