Laptop power adapter Energy4U PA125 — 85 W, MagSafe 2, 4.2 A, 20 V

Energy4U PA125 is a laptop power adapter with an 85 W output and a MagSafe 2 connector, supplying 20 V at 4.2 A. It is engineered as a replacement or spare for laptops that accept MagSafe 2 power delivery, providing stable DC output for charging and operating the computer. The compact design and cable length are appropriate for use at home, in the office, or while traveling, and the adapter is intended for devices that require a MagSafe 2 connection and the stated electrical characteristics.

Advantages

The adapter delivers a consistent 85 W power output with regulated 20 V/4.2 A DC output suitable for charging and powering compatible laptops. The MagSafe 2 connector provides a magnetic attachment that reduces strain on the laptop power port and helps prevent accidental disconnection. The unit is designed for portability with a compact form factor and integrated cable, making it convenient for carrying as a spare or replacement charger. Built-in protection features commonly found in modern adapters—such as overcurrent and short-circuit protection—help maintain safe operation when used as intended.

Suitable for

• Laptops that require a MagSafe 2 power connection and accept 20 V, 4.2 A charging
• Replacing a lost or damaged original MagSafe 2 charger
• Keeping an extra adapter at home, office, or in a travel bag

Key specifications

• Output power: 85 W
• Output voltage: 20 V DC
• Output current: 4.2 A
• Connector type: MagSafe 2 (magnetic)
• Intended use: charging and powering compatible laptops
• Design: compact, portable adapter with attached cable

How to use

Connect the adapter to a mains outlet using the supplied AC lead or plug, then attach the MagSafe 2 connector to the laptop charging port; the magnetic connection will align and hold the plug in place. Ensure the laptop model supports charging at 20 V/4.2 A with a MagSafe 2 connector before use. Monitor the connector and cable for signs of wear and avoid exposing the adapter to moisture or extreme temperatures. Unplug the adapter from the mains when not in use for extended periods.

Usage recommendations

Use the adapter only with laptops that explicitly support MagSafe 2 and the corresponding voltage/current. Avoid bending the cable sharply near the connector and store the adapter in a dry, ventilated place when not in use. If the adapter becomes unusually hot, emits a smell, or shows visible damage, discontinue use and replace it with a qualified unit.