Lenovo 86Wh 4-Cell Li-Ion Internal Battery for ThinkPad P1 Gen 3/4 and X1 Extreme Gen 3/4 (5B10W51871)

If your ThinkPad P1 or X1 Extreme no longer holds a charge through a full workday, this genuine Lenovo 86Wh internal battery restores dependable runtime. It fits the ThinkPad P1 Gen 3, P1 Gen 4, X1 Extreme Gen 3, and X1 Extreme Gen 4, using a 4-cell lithium-ion design that delivers 86 watt-hours and 5600mAh at 15.36V. The battery is intended for internal installation, keeping the laptop's slim profile intact, and comes in black to match the original component.

Key specifications

• Brand: Lenovo
• Model: 5B10W51871
• MPN: 5B10W51871
• EAN: 5715063353813
• Battery chemistry: Lithium-Ion (Li-Ion)
• Capacity: 86 Wh
• Cell count: 4-cell
• Voltage: 15.36 V
• Current capacity: 5600 mAh
• Installation type: Internal
• Rechargeable: Yes
• Colour: Black
• Compatible series: Lenovo ThinkPad P1 Gen 3, P1 Gen 4, X1 Extreme Gen 3, X1 Extreme Gen 4

Why choose it

Genuine Lenovo batteries are engineered to work seamlessly with your laptop's power management, providing accurate charge reporting and safe operation. With 86Wh, you get enough capacity for intensive tasks like video editing, 3D rendering, or long coding sessions without constantly hunting for an outlet. The 4-cell configuration balances weight and runtime, making it a practical replacement that restores your machine to like-new endurance.

Ideal use cases

• Mobile professionals who need all-day battery life for presentations and travel.
• Creative users running demanding software such as Adobe Premiere Pro or AutoCAD.
• IT departments maintaining fleets of ThinkPad P1 and X1 Extreme laptops.
• Students and researchers who work in libraries, labs, or field locations away from power.

Good to know

This battery is designed for internal installation; if you are not comfortable opening your laptop, seek professional assistance. It is rechargeable and should be conditioned with a few full charge/discharge cycles after installation for optimal performance. The black colour matches the standard chassis of compatible ThinkPad models. Always verify your laptop model before purchase to ensure compatibility.