Levin X-Power Pro is a large capacity external battery (10400mAh) in a compact body. Its size is 3.25"L x 3.5"W x 0.81"H, its weight is 8.8oz. The battery is rated as 10400 mAh. Since some power during charging is lost to inefficiencies (such as heat) it will provide approximately 7800 mAh. I was able charge my phone with 3800mAh extended battery from low levels to full twice.
The battery has a bright and clear charging indicator, each of the four segments indicates 25% charge. The indicator does not stay on when you charge, you can turn it back on for a few seconds by pressing the ON button.
This charger has 2 ports labelled 1A and 2.1A.
I tested this charger with Samsung Nexus phone and iPad Mini. This external battery worked with both devices, the speed of charging for iPad Mini was a bit below average, the charging rate for my phone was average. If you are interested in the details of the next I am including them below in the "test results" section.
Test results
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I use the current monitor and a 10 minute charging to test to test all my chargers, this gives me two data points to compare them to each other so I can tell which chargers perform well relative to their peers. For the 10 minute charging test I start each test at about the same level to account for non linear charging.
Samsung Nexus phone
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Port 1A current monitor: 0.81A/4.93V
Port 1A - AC charging - 3% in 10 minutes
Port 2.1A current monitor: 0.77A/4.88V
Port 2.1A - AC charging - 6% in 10 minutes
iPad Mini tablet
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Port 1A current monitor: 0.93A/4.89V
Port 1A - AC charging - 1% in 10 minutes
Port 2.1A current monitor: 1.25A/4.83V
Port 2.1A - AC charging - 2% in 10 minutes
Overall, nice capacity in a relatively small package.
You can find it on Amazon by following this link.
Ali Julia review ★★★★☆
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