phearlez wrote:I've been much happier having several smaller load batteries I can simply keep around and shove in a jacket pocket. Something more the size of a lipstick than something playing-card sized (or larger) like this.
Before anybody gets a wrong impression, this thing is larger than a deck of cards. Comparing it to things I have lying around, it's slightly larger than an eyeglass case, the approximate thickness of a hardback book, almost exactly half the size of an iPhone 5 box (why I still have an iPhone 5 box sitting around is another question, but it is the same height and width, and approximately half the depth) or the total volume of 42 AAA batteries, if you had two layers of three rows of seven batteries. It wouldn't look out of place next to a battery from an older, larger laptop.
The size of a deck of cards, in other words, it is not.
As for actual usage, I bought mine in the last Woot-Off and haven't had enough of a chance to get a fully reliable impression of it. My iPad mini with retina display charges no faster in the 2.1A port than it does in the 1A port (gaining around 16-18% per hour regardless of the port it's connected to), and my iPhone 5 gained a percent a minute (20% in 20 minutes) when plugged into the 1A port.
It is very slow to charge, limited to a 1A charging circuit. After running it to shutoff in my first test, I plugged it in and found it was at 99% charged in 20 hours, and had reached 100% and shut itself off by the time I checked again half an hour later. The biggest advantage of the 22400mAh EC Technology pack linked above would be that it has a 2A charging circuit, which would cut the charging time roughly in half as long as you have a 2A USB power supply. The EC Technology pack doesn't have the LCD display for current charge, but I'm not sure the percentages on the display are all that accurate anyway, so YMMV.
I haven't yet run it completely dead on my second cycle, so I don't have a good idea how much juice it really provides over time. But if you do have room for the weight and need for the extended life, it seems to be a reasonable deal so far.