I received 2 9v batteries for a Taylor Guitar on 25 April 2016 and kept them in the supplied envelope until 1 june 2016 when I first tried them in my guitar. Both batteries lasted a couple of minutes. The guitar is serviceable and a Taylor factory supplied 9v works fine in the guitar. I phoned guitarmania and asked for 2 replacement batteries but it was suggested by Guitarmania that the fault lay with my guitar and not the batteries. Furthermore I was told that it was too long a delay between delivery and use for the Company to provide me with replacements free of charge. I was very disappointed with this response.