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Lenovo

Lenovo 4X50K14091 ThinkPad P50 6-Cell Battery

★★★★★4.1 (17 reviews)

Lenovo's 90Wh 6-cell battery with built-in safeguard chip keeps your ThinkPad P50 powered through extended work sessions.

$125.67*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

The Lenovo 6 Cell Battery 77+ (4X50K14091) is engineered specifically for ThinkPad P50 mobile workstations, providing 90 watt-hours of power from a lithium-ion 6-cell configuration. For professionals who rely on the P50's workstation-class performance in the field — whether for CAD work, data analysis, or software development — this battery delivers the extended runtime needed to work through long meetings, flights, or off-site sessions without constantly hunting for a power outlet.

Lenovo's integrated Battery Safeguard Chip actively monitors the charging and discharging process, providing over-discharge protection that helps preserve the battery's health and lifespan over repeated charge cycles. As a genuine OEM part, the 4X50K14091 is built to Lenovo's specifications for the P50, ensuring proper fit, reliable power delivery, and full compatibility with the laptop's power management system. It functions as both a direct replacement for a worn-out original battery and as a convenient spare that can be swapped in during extended work sessions to keep productivity uninterrupted.

Key Features

Lenovo Thinkpad Battery 77+ (6-cell, 90 Wh) - Lithium Ion (li-ion)

Specifications

Brand
Lenovo
Model
4X50K14091
Battery Type
Lithium-ion (Li-ion)
Number of Cells
6
Battery Energy
90 Wh
Designation
77+
Compatibility
ThinkPad P50 Systems
Features
Over-discharge Protection, Battery Safeguard Chip

Pros & Cons

👍 Pros

  • 90Wh capacity provides extended runtime for demanding mobile workstation tasks
  • Built-in over-discharge protection and safeguard chip protect battery longevity
  • Genuine Lenovo OEM part ensures full compatibility with ThinkPad P50 systems
  • Works as a hot-swap spare for users who need all-day untethered productivity
  • 6-cell lithium-ion design balances capacity with reasonable weight

👎 Cons

  • Compatible only with ThinkPad P50 systems, limiting versatility across other ThinkPad models
  • Lithium-ion batteries degrade over time regardless of safeguard features
  • Adds weight compared to lower-capacity battery options for the P50
  • Premium OEM pricing compared to third-party aftermarket alternatives
  • Battery life per charge depends heavily on workstation workload intensity

Frequently Asked Questions

This battery is specifically designed for ThinkPad P50 systems. It is not cross-compatible with other ThinkPad models without verifying Lenovo's compatibility specifications.
The battery provides 90 watt-hours (Wh) of energy from its 6-cell lithium-ion configuration, which supports extended use between charges.
The built-in safeguard chip monitors and manages charging and discharging to prevent over-discharge, overcharging, and overheating, helping to protect both the battery and the laptop.
Yes, it is designed as a replacement or spare battery, making it ideal for users who need to swap batteries during long work sessions away from a power outlet.
Yes, model 4X50K14091 is a genuine Lenovo battery with the 77+ designation, ensuring compatibility and build quality consistent with original ThinkPad specifications.

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