I am in the process of designing coolers with 12v waterproof boat stereos built in. I am currently using 55ah optima deep cycle batteries which work well, but a new application requires less weight and less play time per charge. I've seen the rechargeable 12v sealed lead acid batteries around the 26ah range, and I'm wondering if they would work well in this application. They weight about half as much as the deep cycle optimas, so that's a huge plus. I'm looking to get around 6-10 hrs of use out of a full charge. If anyone knows whether these would perform well in an application like this, please help me out. Thanks!