Battery Dell 42Wh 3-cell Lithium Ion 27W58 — replacement laptop battery, 42Wh, 3-cell

Replacement Dell laptop battery, 42Wh capacity, 3-cell lithium‑ion design. This unit is intended as a direct replacement for compatible Dell notebooks and restores portable runtime by providing the expected nominal voltage and integrated battery management support for charging and system reporting. The battery is optimized for standard use scenarios where original equipment performance and safety features are required.

Advantages

This 3-cell, 42Wh lithium‑ion battery offers a balance between run time and compact size, enabling longer unplugged operation without significantly increasing weight or thickness. The battery supports standard charging and power reporting functions so the operating system can display charge level and health information. Designed for straightforward installation, it works with the notebook's existing power-management system to maintain safe charging and discharge behavior.

Suitable for

• Replacing an aged or failing battery in compatible Dell laptops
• Carrying as a spare for travel or remote work to extend unplugged usage
• Swapping into a notebook during repair or refurbishment

Key specifications

• Battery chemistry: Lithium‑ion (Li‑ion)
• Capacity: 42 Wh
• Cell count: 3‑cell
• Form factor: Internal laptop battery designed for specific notebook bay or compartment
• Functionality: Supports system charging control and power reporting to the operating system

How to use

Power off the laptop and disconnect any external power source before removing the existing battery. Follow the notebook manufacturer's instructions to access the battery compartment and replace the old battery with the new unit, ensuring correct alignment and secure mounting. After installation, connect the AC adapter and allow the system to recognize the battery; the operating system should detect charging and display the current charge level. For best results, calibrate the new battery if the manufacturer recommends it by charging to full and allowing a full discharge cycle once or twice.

Recommendations

Store and use the battery at moderate temperatures, avoid prolonged exposure to high heat or humidity, and use the original or specified AC adapter for charging. If the battery shows signs of swelling, overheating, or unusual behavior, stop use immediately and replace it. Follow local regulations for battery recycling and disposal.