I use only Ray O Vac exclusively, because out Vet care pays for them. I always take them out of the aid at night, but leave them in the little door of the battery compartment, in a UV dryer by my bed which holds my aides.
BTW, my dog will instantly bite and crush m aides if he gets at them, because of my scent on them, or because they will squeal if one falls out of my ear while I take a nap in my recliner after lunch. He has eaten two sets now.
My batteries never last more than 4 days, I dunno why, but my audiologist has them back to the factory to see if they know why, without answer.
My guess is that they are set pretty high on the volume and use more power that way. They are Starkey RIC BTE aids that use 312 batteries. My Audiologist says that they are middle of the line model. The DVA will not spring for more expensive TOL models. Mine would cost me three grand a pair if I bought them, so THW buying the TOL for myself... My pocket is not that deep these days.
JIX