L20C4PC2 Lenovo Legion 5 17ACH6H Compatible Battery 15.36V 5000mAh
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L20C4PC2 Lenovo Legion 5 17ACH6H Compatible Battery 15.36V 5000mAh - 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.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
L20C4PC2 Lenovo Legion 5 17ACH6H Compatible Battery 15.36V 5000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
15.36V
Amp
5000mAh
Lenovo Legion 5 17ACH6H Series — 15.36V Li-Polymer Replacement Battery (L20C4PC2)
This is a 15.36V, 5000mAh (76.8Wh) Li-Polymer replacement battery for the Lenovo Legion 5 17-inch gaming laptop. It fits the Legion 5 17ACH6H-82JY00GMMX and over 150 compatible Legion 5 variants across the ACH6, ITH6H, and related sub-series. OEM part numbers covered include L20C4PC2, L20M4PC2, L20L4PC2, L20D4PC2, SB11B53887, and SSB11B53884.
- Legion 5 17-inch platform fit: The ACH6H, ACH6, and ITH6H sub-series all share the same 15.36V four-cell battery architecture, connector pinout, and BMS handshake protocol — which is why one part number family covers all of them. Swapping between sub-variants does not affect BMS communication.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on Legion 5 hardware. The BMS negotiated correctly, charge current stepped down properly at 95%, and there was no fault flag at the EC level during load transitions from idle to full CPU and GPU draw.
- Post-install calibration cycle: After fitting, run the laptop on battery until it hibernates at the low-voltage cutoff, then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after replacement
Lenovo's BIOS reads health data from EEPROM embedded in the battery pack — not from live cell measurements. When a new cell arrives, that EEPROM data does not match the charge history the BIOS expects to see, so it flags the battery as degraded or unknown. This is a data mismatch, not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%. After one or two complete cycles the BIOS learn cycle re-establishes baseline data and the health warning clears.
Laptop shuts off at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The OS is reading a fuel map built from the old, degraded cell — so it thinks 25% remaining is safe when the new cell is already near its real low-voltage threshold under load. Under full CPU plus display draw on the Legion 5, voltage sag on a miscalibrated gauge hits the EC cutoff before the reported percentage reaches zero. Fix this by completing two full discharge-to-hibernate cycles followed by full charges — recalibrates the fuel gauge IC against the actual cell chemistry and the premature shutdowns stop.
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 Legion 5 is showing the replacement battery as 0% or "unknown" in Lenovo Vantage — is the battery faulty?
It is not faulty. The Lenovo EC reads health and charge state from EEPROM data stored in the battery pack, and a new cell arrives without the charge history the firmware expects, so Vantage flags it as unknown or 0%. Run one full discharge cycle until the laptop hibernates, then charge uninterrupted to 100%. After one to two complete cycles the BIOS learn cycle resets and Vantage reports correctly.
The system info in Windows shows this battery as 72Wh but the spec says 76.8Wh — why is the number wrong?
Windows pulls the Wh rating from the EEPROM embedded in the battery pack, which stores the manufacturer's rated design capacity. The 72Wh figure you are seeing is the BIOS-adjusted "full charge capacity" after the firmware applies its own degradation estimate to the new cell before calibration is complete. Run two full discharge-to-charge cycles and the reported Wh value will converge toward the actual 76.8Wh spec as the fuel gauge IC calibrates against the real cell chemistry.
New battery installed but charge stops at 80% and will not go higher — is the charger too weak?
The charger is not the issue. Lenovo's BIOS includes a built-in charge threshold feature — sometimes called Conservation Mode — that caps charging at 60% or 80% to reduce cell stress during long periods plugged in. Check Lenovo Vantage under Power > Battery Charge Threshold and confirm Conservation Mode is off. Once disabled, plug in and charge from below 20% to confirm the cell reaches 100%.
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