When I shop for external batteries I always seek out those that have smart charging chip. This means it can charger any device at its optimal charge - Apple devices require 2A, most Android devices require 1A (note that the new Nexus phones do rapid charging at 2.4A when the phone battery is low).
To test if in fact this claim is supported I used a current meter and a resistor with 2A and 1A settings. As advertised both ports were able to deliver the rate advertised by the resister. 0.96A/5.13V delivered with 1A resistor, and 1.85A/5.06V delivered on 2A resistor (it is normal to see some loss due to inefficiencies such as heat loss). Attached are images showing the tests.
The battery has a large capacity (20,000mAh) and is fairly large: 6 3/8" x 3 1/4" x 1". It weighs 1 pound and 0.3 oz. It has two ports. Another feature I like is the digital display showing how much capacity the battery has remaining. The display comes on automatically when I charge, or I can see it at any time by pressing an icon next the display. This is external battery does not allow charge through (i.e. it cannot charge while being charged). I have been using this battery for just over 2 weeks as I write this review. It holds the charge quite well (very little loss when disconnected) and the rating to appears to be accurate.
I received this power bank for evaluation and review. It is a good one!
YOu can find "Vinsic 20000mAh Power Bank" on Amazon by following this link.
Ali Julia review ★★★★★
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