Lenovo 57Wh Internal Li-Ion Battery for ThinkPad X1 Carbon Gen 12 / X1 2-in-1 Gen 9 (5B11H56385)

57Wh of high-density lithium-ion power keeps your ThinkPad X1 Carbon Gen 12 or X1 2-in-1 Gen 9 running through demanding workdays. This genuine Lenovo internal battery delivers 15.36V and 3730mAh across four cells, engineered for the ultra-slim chassis of Lenovo's premium business laptops.

Overview

The Lenovo 5B11H56385 is an internal Li-Ion battery pack designed specifically for ThinkPad X1 Carbon Gen 12 and X1 2-in-1 Gen 9 models. With a capacity of 57 watt-hours, it provides extended runtime for productivity, video conferencing, and multitasking. The battery operates at 15.36V with a current capacity of 3730mAh, ensuring stable power delivery under load. As a genuine Lenovo part, it meets strict quality and safety standards, including overcharge, over-discharge, and short-circuit protection.

What stands out

• High 57Wh capacity for all-day computing on a single charge
• Optimized for ultra-thin ThinkPad X1 Carbon Gen 12 and X1 2-in-1 Gen 9
• Four-cell Li-Ion construction with advanced protection circuitry
• Genuine Lenovo FRU: 5B11H56385 ensures perfect compatibility and reliability
• Rechargeable design supports hundreds of charge cycles

Technical details

• Battery Type: Lithium-Ion (Li-Ion)
• Energy Capacity: 57 Wh
• Voltage: 15.36 V
• Current Capacity: 3730 mAh
• Number of Cells: 4
• Product Type: Internal Laptop Battery
• MPN / FRU: 5B11H56385
• Color: Black
• Rechargeable: Yes
• Overcharge Protection: Yes
• Over-discharge Protection: Yes
• Short Circuit Protection: Yes
• Installation: Internal (requires technical expertise)

Our verdict

For ThinkPad X1 Carbon Gen 12 and X1 2-in-1 Gen 9 owners, this genuine Lenovo battery restores original runtime and reliability. The 57Wh capacity and robust protection features make it a dependable replacement or spare.