Laptop battery Dell 42Wh Lithium‑Ion, model 451‑BCMD, rechargeable internal replacement

This Dell 42Wh Lithium‑Ion internal battery (model 451‑BCMD) is a rechargeable replacement designed for compatible Dell laptops. It provides a 42Wh energy capacity to restore or extend unplugged runtime for everyday mobile computing tasks. The unit is intended as an internal replacement, requiring removal of the existing battery and reinstallation in accordance with the laptop manufacturer’s disassembly instructions.

Advantages

The battery offers a measured 42Wh capacity in a compact internal form that preserves the laptop’s original fit and balance. Being a Lithium‑Ion design, it delivers consistent discharge characteristics and accepts standard charging profiles used in Dell systems. As a direct replacement it minimizes compatibility issues when matched to supported laptop models and helps return the device to portable operation without modifying the power system.

Key specifications

• Battery chemistry: Lithium‑Ion
• Nominal energy capacity: 42 Wh
• Form factor: internal rechargeable laptop battery
• Designed for: compatible Dell laptop models that use a 42Wh internal battery
• Typical use: mobile computing and travel; replaces original internal battery

How to use

Power off the laptop and disconnect any external power or peripherals before beginning. Follow the laptop manufacturer’s service instructions to access and remove the existing internal battery, taking proper electrostatic discharge (ESD) precautions. Install the replacement battery in the same orientation and secure fasteners as required. After reassembly, connect the AC adapter and fully charge the new battery before normal use. Verify battery status in the operating system battery utility to confirm correct installation.

Recommendations

To maximize service life, perform regular charge cycles and avoid prolonged storage at full charge or in high temperatures. Use the laptop’s power management settings to optimize runtime, and ensure the system BIOS and battery drivers are up to date for accurate reporting and charging behavior.