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ZMI 20k Power Bank QB820
Mophie Powerstation XXL USB-C
See Top Ranked Portable Laptop Chargers

ZMI USB-C PD Backup Battery Packs (2017) vs Mophie Powerstation XXL 2018

Analysis:

The ZMI 20k Power Bank QB820 makes for an outstanding Portable Laptop Charger at $68. The Mophie Powerstation XXL USB-C, however, while overall a good product for its asking price, doesn't quite manage to stand out from its competition - there are better Portable Laptop Chargers that can be found for around $30 available here.

The ZMI 20k Power Bank QB820 hasn't managed to get enough recognition from sources that do high-quality hands-on testing and therefore didn't make it into any relevant roundups. That, by itself, makes it difficult to recommend.

As for the Mophie Powerstation XXL USB-C analysis - it impressed reviewers at PCWorld, a source that's known for its objective testing and well-thought-out methodology - it performed great in its "Best power banks 2020: The top portable chargers for your phone" roundup and earned the "Best overall power bank" title.

We also wanted to do a direct ZMI 20k Power Bank QB820 vs. Mophie Powerstation XXL USB-C review performance comparison, but we, unfortunately, weren't able to find any ZMI 20k Power Bank QB820 review scores.

Finally, we compared the Mophie Powerstation XXL USB-C to other Portable Laptop Chargers on the market and found that it did much better than its competitors - its review average of 8.5 out of 10 points is considerably higher than the 7.9 review average of Portable Laptop Chargers in general.

Comparison of expert ratings
Highly Recommended
Recommended
Mentioned
Not Mentioned
Wirecutter (NYTimes)
Wirecutter
Laptop Mag
Macworld
Techradar
Reviewed
PCWorld
TrustedReviews
Digital Camera World
Charger Harbor
Tech. Specs Comparison
ZMI 20k Power Bank QB820
$68
Mophie Powerstation XXL USB-C
$28
Significantly higher than average expert review score
7.9
Overall Avg. for Portable Laptop Chargers
9.4
Avg. Review Score
Score
Higher than average expert review score
7.9
Overall Avg. for Portable Laptop Chargers
8.5
Avg. Review Score
Score
Highly recommended by trusted experts
Wirecutter
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Top 10 Tools to Handle a Power Outage” 
Last updated: 13 days ago
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Top 10 Tools to Handle a Power Outage” 
Last updated: 13 days ago
Reviewed
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Ranked #3 out of 9
in “The Best Power Banks for Laptops and Tablets of 2020” 
Last updated: 22 Nov 2019
Techradar
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Ranked #4 out of 9
in “Best portable laptop battery chargers and power banks in 2020” 
Last updated: 4 May 2020
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best Emergency Preparedness Supplies” 
Last updated: 13 Mar 2020
Wirecutter
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best Emergency Preparedness Supplies” 
Last updated: 13 Mar 2020
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best Nintendo Switch and Switch Lite Accessories” 
Last updated: 3 Mar 2020
Wirecutter
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best Nintendo Switch and Switch Lite Accessories” 
Last updated: 3 Mar 2020
Wirecutter
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best USB Power Banks for Laptops” 
Last updated: 13 Feb 2020
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best USB Power Banks for Laptops” 
Last updated: 13 Feb 2020
Recommended by trusted experts
TrustedReviews
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Ranked #4 out of 6
in “Best Portable Charger 2020: Which power bank should you buy?” 
Last updated: 31 Jan 2019
Reviewed
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Ranked #6 out of 9
in “The Best Power Banks for Laptops and Tablets of 2020” 
Last updated: 22 Nov 2019
New York Magazine
Depth of
analysis
No
In-house
Testing
Runner Up
in “Tech” 
Last updated: 12 Dec 2018
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Mentioned
in “The Best USB Power Banks for Laptops” 
Last updated: 13 Feb 2020
Wirecutter
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Mentioned
in “The Best USB Power Banks for Laptops” 
Last updated: 13 Feb 2020
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