Battery Lenovo 42Wh lithium-ion 5B10S73396 — internal laptop replacement, 42 Wh capacity

Replacement internal lithium-ion battery for compatible Lenovo notebooks with 42 Wh capacity. This battery is intended as a direct internal replacement to restore runtime and charging performance in systems originally designed for this form factor and voltage. It connects to the laptop battery bay and charging circuitry, providing portable power for standard notebook use and enabling continued mobility.

Advantages

The internal 42 Wh lithium-ion cell pack offers a balance between capacity and weight suitable for lightweight notebooks. As a factory-compatible replacement, it preserves original dimensions and electrical characteristics to fit securely and operate with existing charging systems. The battery supports typical charge and discharge cycles for laptop use and is manufactured to meet common safety and performance expectations for lithium-ion laptop batteries.

Suitable for

• Replacing a worn or failing internal laptop battery
• Restoring battery runtime for travel and mobile work
• Maintaining original laptop form factor and weight
• Users needing an OEM-fit internal battery for repair or refurbishment

Key specifications

• Battery chemistry: lithium-ion
• Rated capacity: 42 Wh
• Intended use: internal laptop replacement battery
• Typical application: portable notebook power

How to use

Power down the notebook and disconnect the external charger before beginning replacement. Open the service cover or remove the back panel according to the device service manual to access the internal battery compartment. Disconnect the existing battery connector from the motherboard, remove any securing screws or brackets, and fit the replacement pack in the same orientation. Reconnect the battery cable firmly to the connector, reassemble the chassis, and charge the battery fully before first use to allow the battery management system to calibrate.

Recommendations

Use the replacement battery only in supported Lenovo laptop models and follow the manufacturer’s service instructions. Avoid exposing the battery to excessive heat, moisture, or mechanical shock. If the battery shows swelling, leakage, or abnormal heat during charge or discharge, stop using it immediately and seek professional disposal or replacement.