Don't forget our battery sponsor here at Alldeaf.com you can get a trial package of same size batteries from different makes to see if different manufactures will make any difference in how long the battery lasts. In the past I gotten my batteries from Radio Shack since at the time they had the lowest prices better than supermarkets or even Walmart but I have not brought any batteries from Radio Shack in two years. I get some insurance benefit for my implant batteries and when the implant shuts down I can use those batteries in my hearing aids for a few days.
The trouble with implant batteries is that when the batteries go weak I get a five minute warning before the implant will shut down. The implant is designed to just turn off when the batteries voltage goes bellow a certain level to avoid issue with weak power causing havoc with your head. With one implant I have to deal with three old batteries and three fresh batteries. Sometimes the batteries start flying everywhere when I pull out the batteries out of the cage and I still can not find that one fresh battery that rolled under my car seat!
When I go to concerts I will have a spare battery cage with fresh batteries standing by since I do not want to deal with six batteries in the dark with one implant when the batteries go. Still not a big deal with me.