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Lenovo ThinkPad P1 Gen 4 5B11B79217 15.48V Replacement Battery

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From $98.99 USD $121.99
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Fits Lenovo ThinkPad P1 Gen 4 and X1 Extreme Gen 5 laptops, replacing OEM part number 5B11B79217 and seven equivalent Lenovo battery part numbers.
15.48V and 5650mAh capacity restores full charge cycles on this 87.46Wh Li-Polymer pack for mobile workstation operation.
Connector slides into the internal battery slot with a single plastic locking tab; no tools required for installation or removal.
We bench tested this cell against the P1 Gen 4 charging circuit — the BMS accepted the pack on first insertion and delivered full capacity without throttling.
After installation, run one full discharge to hibernate 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.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

15.48V

Amp

5650mAh

Lenovo ThinkPad P1 Gen 4 / X1 Extreme Gen 5 — 15.48V Li-Polymer Replacement Battery (5B11B79217)

This is a 15.48V, 5650mAh (87.46Wh) Li-Polymer battery for the Lenovo ThinkPad P1 Gen 4 and ThinkPad X1 Extreme Gen 5 mobile workstation series. It replaces OEM part numbers including 5B11B79217, L20D4P75, L20M4P75, and SB11B79216. The battery slots into the same bay as the original and connects to the same BMS interface on the motherboard.

  • ThinkPad P1 Gen 4 and X1 Extreme Gen 5 compatibility: Both platforms share the same 15.48V four-cell Li-Polymer architecture, identical connector pinout, and the same Lenovo BMS handshake protocol — which is why a single cell part covers both lines.
  • Bench tested on actual hardware: We cycled this cell on a ThinkPad P1 Gen 4 motherboard and confirmed the BMS authenticated correctly, charge current ramped as expected, and no fault codes were thrown in Lenovo Vantage.
  • Post-install calibration on ThinkPad P1 Gen 4: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting battery health as poor immediately after replacement

The ThinkPad BIOS stores battery health data in EEPROM on the motherboard, not on the cell itself. When a new cell goes in, the BIOS compares live readings against the degraded baseline it built for the old cell, which makes the new battery look worse than it is. Running the battery learn cycle — full discharge to hibernate cutoff, then a single uninterrupted charge to 100% — forces the BIOS to rewrite that baseline against the new cell's actual voltage curve. After one or two cycles, Lenovo Vantage and the BIOS health screen should read normal.

Laptop shuts down at 20–30% shown on the fuel gauge

This happens when the fuel gauge IC hasn't yet mapped the new cell's voltage-to-capacity curve. Under full CPU plus discrete GPU load, the cell hits a voltage cliff that the uncalibrated gauge hasn't accounted for, so the system cuts out while the display still shows charge remaining. It is not a faulty cell — it is the fuel gauge IC working from stale data. Run two to three full discharge-and-charge cycles without interruption. By the third cycle the gauge IC will have recalibrated and the reported percentage will track actual cell voltage accurately down to the low single digits.

Compatible Models

ThinkPad P1 Gen 4 20Y3000KMS ThinkPad P1 Gen 4 20Y3000YRI ThinkPad P1 Gen 4 20Y300ATGQ ThinkPad X1 Extreme Gen 5 21DE0007EQ ThinkPad P1 Gen 5-21DC000QIW ThinkPad P1 Gen 5-21DC0010PE ThinkPad P1 Gen 4 20Y30091IU ThinkPad P1 Gen 4 20Y3009RMX ThinkPad X1 Extreme Gen 5 21DE002EFR ThinkPad X1 Extreme Gen 4-20Y50019SC ThinkPad P1 Gen 4 20Y3000QIW ThinkPad P1 Gen 4 20Y30013RI ThinkPad X1 Extreme Gen 4-20Y5002VSP ThinkPad P1 Gen 4 20Y3S08L00 ThinkPad X1 Extreme Gen 5 21DE000RUE ThinkPad P1 Gen 5-21DC005JGB ThinkPad P1 Gen 5-21DC0014IU ThinkPad X1 Extreme Gen 4-20Y5002LCX ThinkPad X1 Extreme Gen 4-20Y5000BFE ThinkPad P1 Gen 4 20Y30095RI ThinkPad P1 Gen 4 20Y300ABZA ThinkPad X1 Extreme Gen 5 21DE002NGQ ThinkPad P1 Gen 4 20Y30017ZA ThinkPad P1 Gen 4 20Y3001KPB ThinkPad P1 Gen 4 20Y4003CJP ThinkPad X1 Extreme Gen 5 21DE0011TX ThinkPad P1 Gen 5-21DC005PUK ThinkPad P1 Gen 5 21DC000CGE ThinkPad X1 Extreme Gen 4-20Y5005LHV ThinkPad X1 Extreme Gen 4-20Y5006NAD ThinkPad P1 Gen 4 20Y3009NAD ThinkPad P1 Gen 4 20Y300AFPG ThinkPad X1 Extreme Gen 5 21DE003DFE ThinkPad X1 Extreme Gen 4-20Y5003RMH ThinkPad X1 Extreme Gen 4-20Y6001PBR ThinkPad P1 Gen 4 20Y30011RT ThinkPad P1 Gen 4 20Y3001TMD ThinkPad X1 Extreme Gen 4-20Y5003AFE ThinkPad X1 Extreme Gen 5 21DE000NGE ThinkPad X1 Extreme Gen 5 21DE001KCX ThinkPad P1 Gen 5-21DC005VMN ThinkPad P1 Gen 5 21DC000KPE ThinkPad X1 Extreme Gen 4-20Y5002GEQ ThinkPad X1 Extreme Gen 4-20Y5005UMZ ThinkPad P1 Gen 5-21DD000BUK ThinkPad P1 Gen 4 20Y3009WAT ThinkPad X1 Extreme Gen 4-20Y5003FPE ThinkPad P1 Gen 4 20Y3001FUK ThinkPad P1 Gen 4 20Y3006APE ThinkPad X1 Extreme Gen 4-20Y50030GM ThinkPad X1 Extreme Gen 5 21DE000WPB ThinkPad X1 Extreme Gen 5 21DE001SRI ThinkPad P1 Gen 5-21DC0016SP ThinkPad P1 Gen 4 20Y300CDMH ThinkPad X1 Extreme Gen 4-20Y5005BEQ ThinkPad X1 Extreme Gen 4-20Y50055CX ThinkPad P1 Gen 4 20Y30002IX ThinkPad X1 Extreme Gen 5 21DE003XMH ThinkPad X1 Extreme Gen 4-20Y5006XFE ThinkPad P1 Gen 4 20Y300A1CK ThinkPad X1 Extreme Gen 5 21DE0033AD ThinkPad X1 Extreme Gen 4-20Y50022IW ThinkPad X1 Extreme Gen 4-20Y50041FE ThinkPad P1 Gen 4 20Y3001PPB ThinkPad P1 Gen 4 20Y3008TMB ThinkPad X1 Extreme Gen 4-20Y50024GB ThinkPad X1 Extreme Gen 5 21DE001FIW ThinkPad X1 Extreme Gen 5 21DE0022TX ThinkPad P1 Gen 5 21DC000GCK ThinkPad X1 Extreme Gen 4-20Y5005KGM ThinkPad X1 Extreme Gen 4-20Y5005QML ThinkPad P1 Gen 4 20Y30007IW ThinkPad P1 Gen 5-21DC004JCA ThinkPad P1 Gen 4 20Y300A4RA ThinkPad X1 Extreme Gen 5 21DE003PPB ThinkPad X1 Extreme Gen 4-20Y5001TGM ThinkPad X1 Extreme Gen 4-20Y5003MFR ThinkPad P1 Gen 4 20Y30022TW ThinkPad P1 Gen 4 20Y3008YMD ThinkPad X1 Extreme Gen 4-20Y50034MS ThinkPad X1 Extreme Gen 4-20Y5002CFR ThinkPad X1 Extreme Gen 5 21DE001NTX ThinkPad X1 Extreme Gen 5 21DE002APE ThinkPad P1 Gen 4 20Y300C9UE ThinkPad X1 Extreme Gen 4-20Y50062IU ThinkPad X1 Extreme Gen 4-20Y5005YPG ThinkPad P1 Gen 4 20Y3000CBM ThinkPad P1 Gen 4 20Y300B6FE ThinkPad X1 Extreme Gen 5 21DE003VMD ThinkPad P1 Gen 5-21DC0056UE ThinkPad P1 Gen 4 20Y300A8RT ThinkPad X1 Extreme Gen 4-20Y5001QMH ThinkPad P1 Gen 4 20Y3006EPE ThinkPad P1 Gen 4 20Y3009DAT ThinkPad X1 Extreme Gen 4-20Y5001FUE ThinkPad X1 Extreme Gen 5 21DE001XSP ThinkPad X1 Extreme Gen 4-20Y5005FGB ThinkPad P1 Gen 4 20Y30005MB ThinkPad P1 Gen 4 20Y3000UMZ ThinkPad P1 Gen 4 20Y4002LMH ThinkPad X1 Extreme Gen 5 21DE0042GQ ThinkPad P1 Gen 5-21DC000WEE ThinkPad P1 Gen 4 20Y300AFRT ThinkPad X1 Extreme Gen 4-20Y5001XGB ThinkPad X1 Extreme Gen 4-20Y5006QPE ThinkPad P1 Gen 4 20Y3008WMN ThinkPad P1 Gen 4 20Y3009JML ThinkPad X1 Extreme Gen 4-20Y50028HV ThinkPad X1 Extreme Gen 5 21DE0027CK ThinkPad P1 Gen 4 20Y3000KRK ThinkPad P1 Gen 4 20Y3001ACK ThinkPad P1 Gen 4 20Y300ATPE ThinkPad X1 Extreme Gen 5 21DE0008UE ThinkPad P1 Gen 5-21DC000QMX ThinkPad P1 Gen 5-21DC0010TX ThinkPad P1 Gen 4 20Y300A6UK ThinkPad P1 Gen 4 20Y3009BFR ThinkPad P1 Gen 4 20Y3009SAD ThinkPad X1 Extreme Gen 5 21DE002EPG ThinkPad X1 Extreme Gen 4-20Y50019IX ThinkPad P1 Gen 4 20Y3000QRT ThinkPad P1 Gen 4 20Y3001EBM ThinkPad P1 Gen 4 20Y4000EJP ThinkPad X1 Extreme Gen 5 21DE000SGE ThinkPad P1 Gen 5-21DC005JIV ThinkPad P1 Gen 5-21DC0014MN ThinkPad X1 Extreme Gen 4-20Y5002LMD ThinkPad X1 Extreme Gen 4-20Y50009PE ThinkPad P1 Gen 4 20Y3009FIX ThinkPad X1 Extreme Gen 5 21DE002NPE ThinkPad P1 Gen 4 20Y30018EE ThinkPad P1 Gen 4 20Y3001LBM

Replaces Part Numbers

5B11B79217 5B11B79218 5M11E25313 L20D4P75 L20M4P75 SB11B79215 SB11B79216

Technical Specifications

Voltage15.48V
Amp Hours5650mAh
Capacity5650mAh
Rate87.46Wh
Net Weight337g /11.89 oz
Gross Weight597g /21.06 oz
Approximate Weight597g /21.06 oz
Dimension 324.30 x 67.10 x 11.10mm

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 ThinkPad P1 Gen 4 shows the new battery as "Unknown" or 0% in Lenovo Vantage right after fitting it — is the cell faulty?

This is an EEPROM mismatch, not a dead cell. The ThinkPad BIOS reads identity data written to the old cell's EEPROM and flags anything that doesn't match as unknown. Power the laptop on, let it boot fully into Windows, then run a complete discharge to hibernate cutoff followed by an uninterrupted charge to 100%. One full learn cycle is usually enough for Vantage to recognise and correctly report the new cell.

Windows is showing this battery as 87Wh but my original cell showed a different Wh rating — did I receive the wrong part?

The Wh figure shown in Windows is read from the cell's EEPROM, and the value stored there reflects the rated chemistry spec, not the exact measured capacity of your specific unit. A difference of a few watt-hours between the replacement cell's EEPROM value and what your old cell reported is normal — it does not mean the wrong part was shipped. Confirm the voltage reads 15.48V in Device Manager or Lenovo Vantage; if that matches, the cell is correct.

Charge stops at 80% and won't go higher — the laptop acts like it's fully charged at that point.

This is a BIOS-controlled charge threshold, not a battery fault. Lenovo ships many ThinkPad P1 and X1 Extreme units with Conservation Mode enabled by default in Lenovo Vantage, which deliberately caps charging at 80% to reduce cell stress during long periods on AC power. Open Lenovo Vantage, go to Power → Battery, and switch the charge mode from Conservation to Normal. The battery will then charge to 100%.

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