Battery BTI 57Wh 4-cell L20C4P71-BTI compatible for Lenovo ThinkPad X1 Yoga Gen 8, 15.4V, 3600 mAh, Black

Replacement BTI 57Wh 4-cell lithium-ion laptop battery L20C4P71-BTI compatible with Lenovo ThinkPad X1 Yoga Gen 8 and several ThinkPad X1 Carbon generations. This 15.4 V, 3600 mAh (57 Wh) battery is supplied in black and intended as a single spare battery to restore portable runtime for mobile work, travel, and on-site use. It supports standard charging and operation routines of compatible Lenovo systems and is designed to match the form factor and electrical requirements of the listed notebook models.

Advantages

The BTI 57Wh battery uses Lithium-Ion technology to provide a compact power source with a balance of capacity and weight suitable for thin-and-light business notebooks. Its 3600 mAh capacity at 15.4 V offers a predictable energy reserve for extended unplugged use compared with lower-capacity cells. Supplied as a single unit in black, the battery is intended for straightforward replacement and compatibility with the charging system and power-management features of supported ThinkPad models.

Suitable for

• Lenovo ThinkPad X1 Yoga Gen 8
• ThinkPad X1 Carbon generations compatible with the same battery form factor
• Replacing a depleted internal battery to restore mobile runtime
• Use as a spare battery for travel and fieldwork

Key specifications

• Battery technology: Lithium-Ion (Li-Ion)
• Capacity: 3600 mAh (57 Wh)
• Nominal voltage: 15.4 V
• Cell count: 4-cell configuration
• Colour: Black
• Quantity included: 1 battery

How to use

Power down the notebook and disconnect all external power and peripherals before replacing the battery. Follow the laptop manufacturer's service instructions to access and remove the existing battery, then install the BTI L20C4P71-BTI ensuring correct alignment and secure connectors. After installation, connect the AC adapter and allow the system to recognize and calibrate the new battery according to the notebook's power-management prompts. Use the operating system or BIOS battery indicators to confirm proper charging and state-of-charge readings.

Recommendations

For safe and reliable operation, use the replacement battery only with compatible Lenovo ThinkPad models as specified. Avoid exposing the battery to extreme temperatures, moisture, or physical damage. Follow standard charging practices: allow the battery to charge fully on first use, avoid prolonged storage at full charge or at very low state of charge, and use the original or manufacturer-approved AC adapter and charging routines for best results.