Internal Laptop Battery Lenovo 01AV4221 36Wh 3‑cell

The Internal Laptop Battery Lenovo 01AV4221 36Wh 3‑cell is a replacement internal battery designed for compatible Lenovo notebooks. With a nominal capacity of 36Wh and a 3-cell arrangement, this battery restores portable power to systems originally equipped with an internal, non-removable battery. It is intended to provide reliable runtime for everyday tasks such as office work, web browsing and light multimedia playback, and to maintain device portability when the original battery no longer holds sufficient charge.

Advantages

This internal battery offers a capacity balance suitable for slim and lightweight notebook designs, combining moderate runtime with compact dimensions. Being an original-brand replacement, it is built to match the electrical, mechanical and charging characteristics expected by supported Lenovo models, which helps preserve system stability and charging behavior. Installation returns mobile operation without requiring an external power bank, and the 3-cell chemistry supports stable voltage output during typical use.

Suitable for

• Replacing a worn or failing internal battery in compatible Lenovo notebooks
• Restoring on-the-go battery life for office productivity and web browsing
• Light multimedia playback and video calls
• Users who require an original-brand internal battery to maintain device reliability

Key specifications

• Battery type: internal, 3‑cell configuration
• Rated energy: 36 Wh
• Application: designed for compatible Lenovo notebook models with internal battery bay
• Intended use: mobile power for office tasks, internet browsing and light multimedia
• Physical form factor: slim pack suitable for internal installation (model-specific)

How to use

Power down the notebook and disconnect the AC adapter before beginning replacement. Follow the manufacturer service instructions or a qualified technician’s guidance to access the internal battery bay, remove any retaining screws or brackets, and disconnect the old battery connector from the motherboard. Install the replacement battery in the same orientation, reconnect the battery cable securely, and reassemble the chassis. After reassembly, power on the notebook and allow the system to recognize the new battery; perform a full charge cycle for optimal initial calibration.

Recommendations

Use the replacement battery only in compatible Lenovo models and observe standard safety practices: avoid exposure to heat or moisture, do not puncture or short-circuit the battery, and use the original or manufacturer-recommended charger. If uncertain about the disassembly process, seek professional installation to prevent damage to the notebook.