OXA 7800 mAh Juice Box S1 External Battery
This is a well designed, compact, and effective external power bank. The 7800 mAh capacity is sufficient to charge your smartphone three to four times. Depending on a model it can also be sufficient for charging your tablet computer. I have tested it with iPhone 4S, Galaxy S3, and the first generation iPad. I was able to fully charge my iPad and had no problem charging iPhone and Galaxy several times.
The power bank has a micro USB port that allows it to get charged. However, it doesn’t come with its own USB charger, so you are left to use one of your spare ones, or charge it by plugging it into a spare USB port on your computer.
There are two regular USB ports on the front of this power bank. One supplies 1 A current and the other one a 2 A one. The lower one is usually used by smartphones, while tablets are charged via the higher one. However, these days either one of them can be used with almost any device. The only major difference will be the charging speed. Two USB ports also allow you to charge two device at the same time.
Charging times will vary by the device, from just over an hour for a smaller device, to almost four hours for iPad. These times are more or less typical for external batteries/portable chargers that I have worked with. Charging of the power bank itself takes several hours, and is best done by leaving it plugged in overnight. There are a few small LED lights that tell you the total charge capacity remaining, which is a very useful feature.
There are a couple of features that some other power banks come with which would have made this an even more handy charger. My favorite is a pair of built-in wall outlet prongs. The second favorite is the wrap-around attached micro USB charging cable. Inclusion of those two features ensures that (if you have an Android phone for instance) you never have to worry about bringing along any other cables or chargers with you.
Overall, this looks like a quality product and so far I have had only the best experience with it.
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