I purchased a (16) pack of Duracell #312 batteries at Walmart that performed poorly right out of the package despite a 2020 date. Then I went to CVS and purchased an (8) pack of Duracell #312 batteries that also performed poorly right out of the package despite a 2020 date.
I measured the voltage of the batteries and all were easily below the 1.45v spec. The batteries I measured ranged from 1.32v down to 993mv.
Very poor quality control.
This is unacceptable for those that are hard of hearing.