I think it is about time to replace the 9v battery in my Ibanez SR1400. Sadly, the bass does not have a pop open door. You have to unscrew the back base plate to get to the battery. Did that and notice that it has a GP Supercell battery. Those seem to be hard to find, but if it keeps me from having to remove the back plate very often it might be worth it to replace it with the best, longest lasting battery I can find. Is it worth it to put in another supercell? Do they really last longer? Where do you find yours? Is the Energizer Max in the same league? Those are easier to find.