Hi, and welcome to the forum.
At the risk of coming across as unhelpful (which is not intended) ...
This question has been answered dozens of times. There is a stack of information on power suppplies, adapters, batteries, battery packs and much, much more on the forum.
Searching the forum, and reading the corresponding threads, will tell you everything you need to know, including a range of opinions on the very product you're inquiring about.
At the top of the page you'll find a series of links.
Search is the one you want.
Quote:
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Originally Posted by A Well Known Proverb
Give a man a fish and you feed him for a day; teach a man to fish and you feed him for a lifetime.
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