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ZMI 20k Power Bank QB820
Tronsmart Presto 10400mAh USB-C
See Top Ranked Portable Laptop Chargers

ZMI USB-C PD Backup Battery Packs (2017) vs Tronsmart Presto USB-C Power Banks 2018

Analysis:

The ZMI 20k Power Bank QB820 is an exemplary product and one of the very best Portable Laptop Chargers at the $60 budget.

The Tronsmart Presto 10400mAh USB-C, however, doesn't seem to have enough data available for us to be able to draw any meaningful conclusions.

The ZMI 20k Power Bank QB820 was loved by reviewers at Wirecutter (NYTimes), a highly trusted source that performs reliable in-depth testing. It did great in its "The Best Nintendo Switch and Switch Lite Accessories" roundup where it was named its "Top Pick", which, in itself, makes it a product worth considering.

Taking a look at the Tronsmart Presto 10400mAh USB-C, it got featured in roundups from two reliable sources that conduct their own testing - PCmag and techadvisor.com - but it fell short of earning a top spot in either.

When we thoroughly analyzed their review scores, we learned that all of the sources that tested both Portable Laptop Chargers, including Charger Harbor, preferred the ZMI 20k Power Bank QB820 over the Tronsmart Presto 10400mAh USB-C.

We also took a look at which sources they managed to impress the most. The ZMI 20k Power Bank QB820 was liked best by Macworld, which gave it a score of 10, while the Tronsmart Presto 10400mAh USB-C got its highest, 8.9, score from Charger Harbor.

Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Portable Laptop Chargers on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Portable Laptop Chargers being 7.9 out of 10, whereas the ZMI 20k Power Bank QB820 and Tronsmart Presto 10400mAh USB-C managed averages of 9.5 and 8.3 points, respectively.

Due to the difference in their prices, however, it's important to keep in mind that a direct ZMI 20k Power Bank QB820 vs. Tronsmart Presto 10400mAh USB-C comparison might not be entirely fair - some sources don't take value for money into account when assigning their scores and therefore have a tendency to rate more premium products better.

Comparison of expert ratings
Highly Recommended
Recommended
Mentioned
Not Mentioned
Wirecutter (NYTimes)
Laptop Mag
PCmag
iMore
Macworld
Switch Chargers
Techradar
techadvisor.com
Charger Harbor
Lifewire
Tech. Specs Comparison
ZMI 20k Power Bank QB820
$50
Tronsmart Presto 10400mAh USB-C
Significantly higher than average expert review score
7.9
Overall Avg. for Portable Laptop Chargers
9.5
Avg. Review Score
Score
Has average expert review score
7.9
Overall Avg. for Portable Laptop Chargers
8.3
Avg. Review Score
Score
Recommended by trusted experts
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: 12 days ago
Techradar
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Ranked #5 out of 10
in “Best portable laptop battery chargers and power banks of 2021: stay charged wherever you work” 
Last updated: 17 Feb 2021
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best Power Outage Tools and Supplies” 
Last updated: 10 Sep 2021
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
Recommendations

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