Cooler Master USNA95 Notebook Charger Review

Author: Carl Poirier
Editor: Howard Ha
Publish Date: Thursday, December 9th, 2010
Originally Published on Neoseeker (
Article Link:
Copyright Neo Era Media, Inc. - please do not redistribute or use for commercial purposes.

Cooler Master hits Neoseeker's labs with another product aimed at the portable computing crowd. After having looked at the SF-19 Strike Force notebook cooler, it's now time to put the USNA95 aftermarket charger to the test. These devices very often tend to be neglected when shopping for a notebook, yet sometimes the one that came bundled with it might disappoint due to its size or poor performance.

Cooler Master attempts to address these issues by offering the best of both worlds - a thin design, with continuous 95W power delivery and an efficiency of up to 90%. That's what the USNA95 hopes to deliver, and that's what we'll be looking at today!


Model RP-095-USNA-A1
Input Voltage 100 - 240 Vac full range
Input Frequency Range 50 - 60 Hz
Output Rating 18 ~ 20 Vdc; 19 Vdc ~ 4.74A 4.75 ~ 5.25 Vdc; 5 vdc ~ 1A
LED Indicator Green LED indicates power on

Red LED indicates USB charge
Operation Temperature 0 ~ 40°C
Efficiency Up to 90%
Dimension 62 x 17 x 104 mm

2.4 x 0.7 x 4.1 inch
Protection OVP / OTP / OCP / OPP / SCP<
Warranty 2 years
UPC Code 884102008238

Specifications are courtesy of Cooler Master @

Included in the package is the charger itself, its cables and tips, a cable clip, a travel pouch and the user's manual.

The unit is not a perfect rectangle, having some rounded edges for a smoother appearance. Its size is comparable to two 2.5" notebook hard drives stacked on top of each other; technically it's a tad longer, but a bit narrower and thinner.

The power cable connecting the charger to the wall outlet is standard, thus easily replaceable. The same cannot be said about the one going to the laptop though, but this is to be expected since there has to be some sort of connector for the interchangeable tips. One great feature is the USB port located directly on the charger itself; it alleviates the need for having a computer nearby just to recharge pocket devices which can do only so, as dumb as it sounds, through a USB connection. *cough* Apple *cough*.

There are nine different power connectors available, which cover the vast majority of laptops. There is a small applet on Cooler Master's website that can be used to determine if a particular laptop is supported.

Powering the USNA95 will make the LED light green, as shown in the following picture. If it's charging a device, it will turn red.

It is now time to put it through its paces!


Test Setup

  • Lenovo Thinkpad T500
  • Linux Ubuntu 10.04
  • 56.2Wh 20V battery



The test consists of draining our laptop battery entirely, then tracking the time each charger takes to recharge it to 65%. During that time, the laptop is left idling on the desktop, with the automatic sleep inhibited. The screen brightness is set at maximum.

One can clearly see that the USNA95 is faster than the stock charger. As for the heat generated, both chargers were pretty equal.

The USNA95 has one big advantage: its size. It's touted by Cooler Master as "the world's smallest 95W adapter", and seeing it, it isn't hard to believe. Even more impressive is that besides the 95W main power delivery system, additional circuitry has been included to provide 5V DC, meant for charging or powering USB devices. This one can provide up to 1A, which is ten times the maximum of USB 2.0.

As for the performance of its 19V DC supply, it is better than the already powerful 90W adapter it was compared to. Now, if it was used to replace a lesser adapter like a 65 or 45W, the difference would be even greater.

Overall, the USNA95 is a high-quality device that gets the job done easily, be it for replacing a broken adapter or serving as a spare one. Selling for approximately sixty bucks, it isn't the cheapest, but its features make the price worth it.


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