Hi all! In the first place, sorry for my english. Second, i want to buy a external battery for my surface pro 2, i am seeing that the surface pro 2 needs 12V and 3,6 Mha with an adapter to can charge it. Then I saw this : http://www.amazon.de/Batterie-Multi-Volt-Ladegerät-Notebooks-Smartphone/dp/B00N9Z7BNC/ref=sr_1_1?s=ce-de&ie=UTF8&qid=1419638021&sr=1-1&keywords=Externe Batterie 12v and http://www.amazon.co.uk/gp/product/...act_title_1?ie=UTF8&psc=1&smid=A2PGPJL0BBLHLX and finally http://www.amazon.co.uk/gp/product/B00OS9BD0A/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A7KIOFC92WG0Y anyone can help me and say if one of these batteries could work? If not, could say me one battery can i buy for charge my surface pro 2? ty, and have a nice day!