Laptop power adapter Energy4U CA02 — 40 W, 20 V, 2 A, 2.5 mm DC plug

Energy4U CA02 is a 40 W laptop power adapter with a 20 V, 2 A DC output and a 2.5 mm round plug. Designed to provide a stable low-voltage supply, this compact adapter is suitable as a replacement or spare charger for notebooks and other portable devices that accept a 20 V/2 A input via a 2.5 mm connector. The adapter is intended for everyday use at home, in the office or while traveling and supports continuous charging and device operation within its rated power limits.

Advantages

The adapter delivers steady 20 V/2 A output power with overcurrent protection and stable voltage regulation to reduce the risk of damage to compatible devices. Its 2.5 mm DC plug ensures a common, secure connection to supported laptop models. The unit’s 40 W rating offers sufficient power for many compact laptops and lightweight notebooks while keeping size and weight low for portability. Built with standard safety features, the adapter provides reliable operation for typical charging and powering tasks.

Suitable for

• Charging laptops and netbooks that accept 20 V/2 A input via a 2.5 mm DC jack
• Using as a replacement or spare power adapter at home or office
• Travel use where compact, lightweight chargers are needed
• Powering compatible devices during prolonged desk use

Key specifications

• Output voltage: 20 V
• Output current: 2 A
• Output power: 40 W
• Connector type: 2.5 mm round DC plug
• Use case: AC-to-DC external power adapter for laptops and compatible devices

How to use

Connect the adapter to a suitable mains outlet using the supplied power lead or an appropriate IEC/region-specific cable. Insert the 2.5 mm DC plug firmly into the device’s power jack. Verify that the target device accepts a 20 V/2 A input before use. When connected, the adapter supplies power and charges the device battery according to the device’s charging circuitry. Disconnect from mains and the device when not in use or during long storage.

Usage recommendations

Use this adapter with devices explicitly rated for 20 V and up to 2 A input and with matching 2.5 mm DC jacks. Avoid forced connections to incompatible ports, and keep the adapter ventilated and away from liquids. If the device requires higher power than 40 W, choose a higher-rated adapter to prevent underpowering or equipment instability.