Sounds like something is wrong with them. Weak batteries should give you less/no sound not more because those muffs transmit sound from the microphones or stop when it's noisy. They aren't active "noise canceling" style.
I read a couple of reviews on that model where people complained that the "ear cup gaskets" are too hard and don't form fit to provide a good seal. If true that can render muffs essentially useless since it provides a nice open channel for sound around shooting glasses.
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