135W Laptop Charger for Lenovo ThinkPad X1 Extreme - Slim Tip Adapter

In this review the focus is on a practical replacement power brick for Lenovo laptops, specifically the 135W slim tip adapter sold under the DONGERDI name. The bottom line: this charger is for owners of compatible Lenovo Ideapad Gaming and ThinkPad X1 Extreme or P1 models who need a reliable, compact 135W adapter that mirrors the original Lenovo barrel-style plug. It is not USB-C, but it delivers a full 20V at 6.75A, so those who need the same power profile as the factory unit will find it an effective and inexpensive substitute.

Key Features

• 135W output: Provides 20V at 6.75A to supply high-performance Lenovo laptops that require a higher wattage adapter for charging and sustained load.
• Slim tip connector: Uses the dedicated Lenovo slim-tip barrel plug rather than USB-C, matching the physical interface of many Ideapad Gaming and ThinkPad X1/P1 models.
• Compact, sturdy case: The brick is described as compact and well built, making it easier to pack for travel than bulkier OEM chargers.
• Included cable and strap: Ships with the AC cable and a flexible nylon strap to keep cords organized and reduce desk clutter.
• Safety certifications: Meets North American FCC and European CE standards, offering reassurance about basic safety and regulatory compliance.
• One-year repair service: Backed by a one year repair policy, which provides support in case of defects during normal use.

Who It's For

This adapter is best suited for users of Lenovo Ideapad Gaming 3-15 series, L340 models, and the ThinkPad X1 Extreme or P1 who need a direct-replacement slim-tip charger capable of delivering up to 135W. It is especially useful for gamers, creators, and professionals who rely on the higher power delivery to keep performance up under heavy CPU/GPU loads.

It is not appropriate for laptops that require USB-C power delivery or for those who prefer a multiport universal charger. Buyers should confirm their machine uses the slim tip (barrel) connector and accepts 20V/6.75A before purchasing.

Pros & Cons

Pros

• Delivers full 135W at 20V/6.75A to match higher-power Lenovo laptops.
• Slim-tip connector ensures physical compatibility with many Ideapad Gaming and ThinkPad X1/P1 models.
• Compact and sturdy construction makes it convenient for travel and everyday use.
• Includes cable, nylon strap and meets FCC/CE safety standards for added confidence.

Cons

• Not a USB-C charger, so it will not work with newer USB-C only laptops or devices.
• Design and exact cable length may differ from the original OEM charger, which could affect desk routing for some users.

Specifications

Brand	DONGERDI
Output	20V, 6.75A (135W)
Connector	Slim tip (non USB-C)
Compatible models	Lenovo Ideapad Gaming 3-15, L340 series, ThinkPad X1 Extreme, ThinkPad P1
Safety	FCC (North America), CE (Europe)
In the box	Charger and AC cable
Warranty	1 year repair service

Our Verdict

For owners of compatible Lenovo gaming and high-performance laptops who need a straightforward, reliable replacement brick, this 135W slim tip charger represents a practical value: it provides the necessary 20V/6.75A power, is compact for travel, and includes basic safety certifications and a one year repair policy. Those requiring USB-C power delivery or an OEM-labeled unit may prefer other options, but for direct slim-tip replacements this adapter performs well for its price.

Frequently Asked Questions

Will this charger work with my ThinkPad X1 Extreme?
Yes, it is listed as compatible with ThinkPad X1 Extreme models that use the slim-tip connector and require up to 135W.

Is the port USB-C?
No, this charger uses the Lenovo slim tip barrel connector and is not a USB-C power adapter.

What is included in the box?
The package includes the charger brick and the AC power cable, plus a nylon strap to manage the cord.