Laptop power adapter Energy4U CA17 40 W, 19.5 V, 2.05 A, 5 mm plug

Energy4U CA17 40 W laptop power adapter delivers a stable 19.5 V DC output at 2.05 A through a 5 mm round plug, suitable as a replacement or spare charger for compatible laptops and ultrabooks. The compact external adapter is intended to provide continuous power while the device is in use and to recharge the battery when connected. Designed for users who need a straightforward, single-voltage solution, the adapter supports basic power and charging needs where voltage, current and plug dimensions match.

Advantages

The adapter provides a fixed 19.5 V output and rated 2.05 A current suitable for many notebook models that accept a 5 mm round DC connector. Its 40 W power rating balances compact form factor with sufficient output for charging and light to moderate device operation. The unit is compatible with common travel and replacement use cases, offering a simple plug-and-play experience without additional configuration. Built with standard safety features, it helps maintain stable voltage to protect connected equipment during normal operation.

Suitable for

• Replacing a lost or damaged OEM 19.5 V, 2.05 A laptop charger with a 5 mm plug
• Supplying power to ultrabooks and laptops that draw up to 40 W
• Using as a travel adapter when working away from a primary charger
• Powering a device during software updates, presentations, or extended use

Key specifications

• Output voltage: 19.5 V DC
• Output current: 2.05 A
• Maximum output power: 40 W
• Connector type: 5 mm round DC plug
• Form factor: external AC-to-DC power adapter

How to use

Connect the adapter to an AC mains outlet using the supply cable and insert the 5 mm round plug into the laptop's DC input jack. Ensure the laptop model accepts a 19.5 V, 2.05 A supply and that the plug fits securely. After connection, verify charging or power indicator on the laptop. Disconnect the adapter from the mains when not in use and unplug the DC plug before transporting the device. Avoid exposing the adapter to liquids, extreme heat, or continuous vibration to maintain reliable operation.

Usage recommendations

Use this 40 W adapter only with laptops and ultrabooks that specify a 19.5 V input and a compatible 5 mm round connector; using it with incompatible devices may result in insufficient power or potential damage. For uninterrupted work, keep the adapter on a flat, ventilated surface and periodically inspect the cable and connector for wear.