Battery Lenovo 01AV436 Li‑Ion 42Wh (3735mAh) replacement for laptops

Lenovo 01AV436 Li‑Ion 42Wh (3735mAh) replacement battery is a rechargeable power unit designed to restore portable runtime for compatible Lenovo laptops. It offers a nominal energy capacity of 42Wh, enabling continued operation of the device when mains power is not available. The battery is intended as a direct replacement or spare for systems that accept this form factor and electrical specification, and it should be installed following the laptop manufacturer's service instructions.

Advantages

This replacement battery uses lithium‑ion chemistry to provide a balance of energy density and weight, delivering 42Wh (3735mAh) of stored energy for extended mobile use. It is built to match OEM sizing and electrical characteristics, allowing for straightforward swap‑in installation on compatible models. The unit supports standard charging via the laptop's internal charging circuitry and can restore original runtime without requiring additional adapters or external chargers.

Suitable for

• Replacing a worn or failing internal laptop battery
• Keeping as a spare battery for travel or field work
• Restoring portable runtime for productivity, web browsing, or media playback
• Use in environments where mains access is intermittent or unavailable

Key specifications

• Chemistry: Lithium‑ion (Li‑Ion)
• Nominal energy: 42Wh
• Capacity: 3735mAh
• Intended use: Internal laptop replacement battery
• Compatibility: Designed for laptops that accept this battery form factor and electrical ratings
• Charge method: Charged via laptop's built‑in charging circuitry

How to use

Before installing, power down the laptop and disconnect it from any power source. Follow the laptop manufacturer's instructions to access and remove the existing battery, taking appropriate electrostatic and safety precautions. Insert the replacement battery into the correct compartment, ensuring connectors align and the unit seats fully. Reassemble the laptop, connect the mains adapter, and allow the battery to charge according to the device's standard charging procedure. Monitor the first few charge/discharge cycles to confirm normal operation and battery recognition by the system.

Recommendations

Operate and charge the battery within the temperature ranges recommended by the laptop manufacturer, avoid exposure to moisture, and recycle or dispose of the old battery according to local regulations. For longest service life, avoid deep discharges and prolonged storage at full charge; store the battery at moderate state of charge if kept as a spare.