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Power Bank for SP3?


New Member
Hey guys.
I am sorry if I my post is going to overlap with an older one, but I could not find a specific one through the threads. I have the SP3 for some time now and I do use it on the go. So far, the battery itself has been enough for me, but I have been looking into buying a power bank of some sorts. I did face some challenges though, as which one to buy, how much capacity should it have and what kind of power output do I actually need for my SP3. I am a bit concerned about buying one anyways, cause I do not want to damage my SP3, because I have used an unreliable or cheap powerbank, or because I have used the wrong V output.
I was thinking to buy a quality device that could support me if i am away from a socket for over a day or more, I believe that would mean at least one full charge of the SP3.
So if anyone of you guys is using such a thing and could share some experience and recommendations :)

PS. This is a list of the ones I have found myself, after some reading and digging around the web:
1) http://www.amazon.com/gp/product/B0...ue&ref_=ox_sc_sfl_title_1&smid=A3DNJ55ZGSMH7I
2) http://www.amazon.com/gp/product/B0...mini_detail?ie=UTF8&psc=1&smid=A2KUZVNQ9LP7N9
3) http://www.amazon.com/Anker-20000mA...=1446049564&sr=1-1&keywords=anker+astro+pro+2
7)Mikegyver 34.2AH Surface Pro 3 External Battery & Car Adapter

And I assume I would need a cable like this one:

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