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Rectangular black laptop battery with connector edge visible

GreenTechLLC

GreenTechLLC L20M4P75 laptop battery 90Wh 15.52V 5805mAh 4-cell black for ThinkPad P1 Gen 4 X1 Extreme 4th Gen

SKU CH-ZFYX-SFEAV

A 90 Wh, four-cell lithium-ion replacement battery at 15.52 V for ThinkPad P1 Gen 4 and X1 Extreme 4th Gen laptops

  • Battery type4 Cell Lithium-Ion
  • Battery voltage rating15.52 V
  • Battery capacity5805MAH
  • Product colorBlack
  • Product typeBattery
  • Compatible withLENOVO THINKPAD P1 GEN 4, THINKPAD P1 GEN 4 20Y3, THINKPAD P
  • 90 Wh capacity extends runtime between charges
  • 52 V output matches original specification for stable power
  • 4-cell lithium-ion design fits the internal bay without modification
  • Replaces six OEM part numbers including L20M4P75 and 5B11B79217
  • CE FCC RoHS certified for electrical safety compliance

Replacement Battery for ThinkPad P1 Gen 4

This 90.1 Wh lithium-ion unit replaces OEM part numbers L20M4P75, L20D4P75, SB11B79215, SB11B79216, 5B11B79217 and 5B11B79218. It is built for Lenovo ThinkPad P1 Gen 4 models 20Y3, 20Y4 and ThinkPad X1 Extreme 4th Gen models 20Y5, 20Y6. The 4-cell pack delivers 15.52 V and 5805 mAh capacity.

Installation Fit and System Impact

The battery slots into the existing internal bay without adapter cables or firmware updates. Its 15.52 V output matches the original specification so the power-management controller recognises it immediately. The 90.1 Wh capacity restores full mobile runtime and frees the user from tethered operation. No additional hardware or BIOS changes are required.

Tested Safety and Certification

Each unit is tested for correct voltage, circuit protection, stable current and low self-discharge before shipping. The pack carries CE, FCC and RoHS certification for regulatory compliance. A six-month replacement warranty covers early-life defects. No software utilities or accessories are bundled.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $59.99
Pricier than about 89% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameGreenTech
Model nameL20M4P75, L20D4P75, SB11B79215, SB11B79216, 5B11B79217, 5B11B79218
Part numberL20M4P75, L20D4P75, SB11B79215, SB11B79216, 5B11B79217, 5B11B79218
Product colorBlack
Product typeBattery
Power
Battery type4 Cell Lithium-Ion
Battery voltage rating15.52 V
Battery capacity5805MAH
Compatibility
Compatible withLENOVO THINKPAD P1 GEN 4, THINKPAD P1 GEN 4 20Y3, THINKPAD P1 GEN 4 20Y4, THINKPAD X1 EXTREME 4TH GEN, THINKPAD X1 EXTREME 4TH GEN 20Y5, THINKPAD X1 EXTREME 4TH GEN 20Y6

Questions about this item

How long does the 90 Wh capacity last under continuous full-load use?

The 90.1 Wh rating gives the total energy stored; actual run time depends on the laptop's power draw, which varies by workload, screen brightness and connected peripherals.

Does the 4-cell lithium-ion pack run hot or make noise during all-day operation?

The battery itself has no moving parts and produces no audible noise; heat output is normal for a 15.52 V lithium-ion pack under load and is managed by the laptop's own thermal system.

Which ThinkPad models must I already own for this L20M4P75 battery to fit?

It fits ThinkPad P1 Gen 4 (20Y3, 20Y4) and ThinkPad X1 Extreme 4th Gen (20Y5, 20Y6) that originally use part numbers L20M4P75, L20D4P75, SB11B79215, SB11B79216, 5B11B79217 or 5B11B79218.

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