Hello everyone, I have a question about batteries for the AE-1 Program. Is there any difference between the Duracell PX28LB and Duracell PX28L? Or the Duracell PX28A and the PX28AB? I bought a Duracell PX28L and I was wondering if the Duracell PX28LB was any better, and if there is any difference between the Duracell PX28A and the PX28AB and if one was better than the other. Thanks for any and all replies!!