Battery Lenovo 3-cell 42Wh lithium-ion 5B11M89996 replacement battery for compatible Lenovo laptops

Replacement Lenovo 3-cell 42Wh lithium‑ion battery designed to restore portable power to compatible Lenovo laptops. This three-cell battery delivers 42Wh of capacity for everyday mobile use, providing runtime suitable for office tasks, web browsing and light multimedia. The battery is intended as a direct replacement for worn or failing cells and is compatible with laptop models that accept this physical size and connector type.

Advantages

This 42Wh lithium‑ion pack offers a balance of capacity and compact size, maintaining a slim profile while restoring usable runtime. The three-cell configuration provides stable voltage and predictable discharge characteristics for typical laptop workloads. Installation is straightforward and reversible, allowing users to replace the battery without specialized tools in most designs. The battery conforms to common safety expectations for consumer laptop packs when used according to manufacturer guidelines.

Suitable for

• Office productivity: word processing, spreadsheets, email
• Web browsing, video streaming and light multimedia
• Replacing worn or degraded original batteries to extend device life
• Users who need an affordable battery swap for daily mobile use

Key specifications

• Cell chemistry: lithium‑ion (Li‑ion)
• Number of cells: 3
• Energy capacity: 42Wh
• Form factor: slim internal laptop battery (three-cell pack)
• Typical use: consumer laptops for everyday computing tasks

How to use

Power down the laptop and disconnect it from any external power source before starting the replacement. Remove the access panel or battery compartment cover according to the laptop manufacturer’s instructions, taking care to store screws and small parts safely. Disconnect the existing battery connector from the motherboard and remove the old battery. Install the replacement battery by aligning the connector and securing the pack in its compartment, then reattach the access panel. Reconnect AC power and allow the new battery to charge fully before first use to ensure proper calibration and initial runtime reporting.

Recommendations

For safe and optimal performance, operate the battery within the laptop’s recommended temperature range and avoid deep discharges when possible. Use the laptop manufacturer’s charging settings if available, and update system firmware and power management drivers to ensure correct battery reporting. Dispose of the removed battery at an approved recycling facility and avoid exposure to water, extreme heat or physical damage.