Internal lithium-ion battery Lenovo 5B11M90029 3.7V 2600mAh replacement for compatible Lenovo devices

Internal lithium-ion battery Lenovo 5B11M90029 is a rechargeable cell with a nominal voltage of 3.7V and a rated capacity of 2600mAh. It is intended as a direct replacement battery for compatible Lenovo laptops or tablets that use the same physical format and electrical specifications. The battery restores portable power for device operation and is intended for device maintenance or repair, following manufacturer safety and installation guidelines.

Advantages

This internal lithium‑ion battery offers a compact design and a rated capacity of 2600mAh that helps restore usable runtime to compatible Lenovo devices. Its nominal voltage of 3.7V matches common single‑cell lithium‑ion battery requirements, allowing straightforward replacement when the original battery has degraded. The cell provides stable output for normal device functions and is suitable for repair scenarios where original‑spec performance is required.

Suitable for (tasks / use cases)

• Replacing a worn or failing internal battery in compatible Lenovo laptops or tablets
• Device maintenance and repair by technicians or experienced users
• Restoring battery runtime for on‑the‑go productivity and standard mobile use
• Testing and diagnostics where a known good battery is required

Key specifications

• Cell type: lithium‑ion rechargeable cell
• Nominal voltage: 3.7 V
• Rated capacity: 2600 mAh
• Intended use: internal replacement battery for compatible portable devices
• Form factor: internal pack designed to fit specified device models

How to use

Before installation, power down the device, disconnect any external power sources, and follow the device manufacturer's instructions for safe access to the internal battery compartment. Replace the old battery with the new battery matching the same orientation and connector type, secure it as required by the device chassis, and reconnect any cables. After reassembly, charge the battery fully through the device's standard charging procedure before normal use to allow the device to calibrate battery reporting. If in doubt, seek professional repair services.

Recommendations

Use this battery only in compatible Lenovo devices. Avoid exposure to extreme temperatures, puncture, or short circuits. Dispose of the battery according to local regulations for lithium‑ion cells and follow safety guidance provided by the device manufacturer.