I own several wall chargers and power bricks and run the same set on tests on each of them, so I can be compare them to each other using "apples to apples" comparison. This set of tests allows me to provide unbiased results as the numbers speak for the performance of each unit.
These comparison tests reveal that this charger provides pretty good speed of charging and capacity (even though it is not the fastest or has the most capacity), however it is unbeaten in its compact size.
The size of the power bank is 3.75" x 0.75" x 0.75". It weighs 2.9 oz on my digital scale. It is quite compact, however I need to point that the lipstick comparison is slightly exaggerated. I am attaching a photo collage of 6 photos, and Photo #5 show this power bank next to a couple of lipsticks for relative size comparison. The photos can be located by following 'customer photos' link under the main photo in this listing.
My methodology for testing power banks is to charge each mobile device for 10 minutes and measuring how much each unit was charged in that 10 minute period. Each line in the table below represents a separate 10 minute test.
I use Battery App by Elvison to determine how each device recognized the charging source. 'AC' status means the charging is at full charging rate. 'USB' status indicates charging at a lower charging rate. 'Discharging' status means that the charging rate is below the power that the device is consuming so it slows down the discharge rate but does not re-charge. Photo #1 show what the Battery App shows during one of the tests.
✔ Nexus 7 Tablet
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chargind cable -- AC ............. 3% change in charge in 10 minutes
✔ Samsung Galaxy Nexus Phone
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charging cable -- AC ............. 5% change in charge in 10 minutes
data cable ------ USB............. 0% change in charge in 10 minutes
✔ Samsung Galaxy Tablet 7.7
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charging cable -- AC ............. 3% change in charge in 10 minutes
***Note for Samsung Tablet users*** Yubi power provides Samsung Tablet connector tips free on request. If you already have interchageable connector cables (this unit does not come with interchangeable tip cables) these Samsung tablet tips give me much better speed of charging then using a cable that came with my Galaxy tablet.
✔ iPad Mini
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iPad Mini cable -- AC ............. 3% change in charge in 10 minutes
In addition to 10 minute charge speed tests, I ran two other tests:
✔ iPad Mini
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Starting with iPad Mini discharged and Yubi Power Bank full I was able to charge iPad Mini to 29% full at which point the power bank was out of power (about 3 hours)
✔ Sansa Clip+ MP3
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When I charge Sansa MP3 with a standard AC charger, the MP3 player goes into charging mode, displaying the charging animated icon. When it is plugged into the Yubi Power Ultra Compact power bank the MP3 continued to play the content. This is a great benefit for MP3 player with built-in battery, this means I charge and listen at the same time. I do not have to wait for the battery to recharge. Photo #6 shows Sansa next to the power bank for relative size comparison.
I received this unit for evaluation, testing, and review from the manufacture. Running a set of standard test allows me to provide unbiased numeric evaluation and comparison of different units. Based on this comparison this unit measures up very well.
➨ Overall:
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Great size power bank to have on the go. Very good performance for a unit of such a compact size. When I exercise this is the power bank I take with me.
You can find it on Amazon by following this link.
Ali Julia review ★★★★★
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