For the price, this is an excellent product. I had previously bought the much more expensive Bose Soundlink but I had problems with charging the unit after a few weeks. This Anker device was something I bought about a month ago since the Bose was not working, and I have not had any problems with it at all. I was pleasantly surprised by the sound quality and volume given its size, and also the battery. I have not conducted any technical tests on the battery but based on my experience the battery has been performing a lot better than I thought it would.