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Lenovo 42T4427 AC adapter brick with 20 V DC output

Lenovo

Lenovo 42T4427 AC Adapter 20 V DC

SKU CH-MJ9D-R4YT6

20 V DC AC adapter compatible with Lenovo ThinkPad Edge E420s and S420 notebooks

  • Plug typeAC Adapter
  • Delivers stable 20 V DC power to your notebook
  • Genuine Lenovo 42T4427 adapter ensures reliable compatibility
  • Designed for ThinkPad Edge E420s and S420 models
  • Replaces lost or damaged original charger with exact match
  • Ready to use straight from the box

Lenovo 42T4427 AC Adapter for ThinkPad Edge

This 20 V DC power supply is built for Lenovo ThinkPad Edge E420s and S420 notebooks. It replaces a lost or damaged original charger so the laptop can run and charge its battery. Buyers who need a higher wattage unit or a different connector should look elsewhere.

Installation is a direct plug-in

Connect the barrel tip to the notebook and the AC cord to a wall outlet. No drivers or configuration are required. The most common issue is ordering the wrong tip size for a similar-looking ThinkPad model, so verify the exact part number before fitting.

Confirm the notebook model and voltage

Check that the laptop is a ThinkPad Edge E420s or S420 and that its label shows a 20 V DC input requirement. Ensure the barrel connector matches the port on your machine. This adapter is not suitable for other voltage or connector types.

How it compares

Measured against everything we stock in Switch Modules, Transceivers & Add-Ons, at today’s prices. Recalculated every night.

Price $20.99
Cheaper than about 86% of the 1,517 comparable items (median $68.99).

Specifications

Product
Brand nameLenovo
Power
Plug typeAC Adapter

Questions about this item

How can I confirm the Lenovo 42T4427 AC Adapter is working correctly after connecting it?

The adapter should power the ThinkPad Edge E420s or S420 immediately, with the notebook's charging indicator lighting up and the battery icon showing a charging state.

What is included with the Lenovo 42T4427 AC Adapter and what must be purchased separately?

The package contains the AC adapter unit with a fixed output cable; a compatible AC mains power cord for your region is not included and must be sourced separately.

Which Lenovo 42T4427 AC Adapter version should I choose for my ThinkPad Edge notebook?

Select this 20 V DC model (part number 42T4427) if your ThinkPad Edge is an E420s or S420, as it is the specified compatible adapter for those models.

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