I live in Australia and want to buy a good quality power bank for my Google Nexus 7 tablet. I have done a bit of research on the internet and apparently you need at least a 5700ah output. Other articles make it clear that there are a lot of products out there claiming all these specifications but some of them are using refurbished batteries to lower costs and make more profit. Like all cheap products you see on places like Ebay sometimes you only get what you pay for. So I am a bit sceptical about buying some of the cheapies you find there. Some names of brands that seems to be ok that I found on my reseach include Anker, Xtorm and Mycharger. I am not sure that all these are readily available in Australia. Does anyone have any experience with some good power banks that might be available in Australia?