Bests & Worsts Reviews from Amazon

Bought two of these. Anker is pretty good quality. What we found with this model is that is DOES hold a large electricity supply, but it has very poor shelf life. That is, if I fully charge it, then keep it on my desk for a week or two without using it, it DISCHARGES completely. While in use, yes, it can power a phone or two quite well. But it is not reliable as a backup if it has been sitting around more that a few days. EDIT: Dec. 9, 2016: The seller noticed my poor review and felt that they wanted to help me out. They sent me another battery FREE, postage prepaid. It works perfectly-- good shelf life, not like the first two. When I told the seller, then they sent me ANOTHER one... free. So now I have two GOOD ones which do hold the shelf life, from a company who really cares about making the product right!