Don’t be like me… I was being “penny wise and dollar foolish”. With this hot weather everyone perspires and moisture is death on hearing aids. I started having problems with my aids. When I would insert a new battery, it would almost immediately make the low battery tone and the battery would go dead. Finally one stopped working completely. Aaron explained that it seemed like the circuitry was messed up and it was just “sucking” the power out of the battery, possibly being caused by moisture. Aaron has a product called ReSound which is a desiccant (it absorbs moisture). He sells it for $9.95. I might note, Amazon has the same product BUT it is priced higher at $15.99… which shows Aaron deals fairly and tries to be reasonable in price. The point being, I tried the ReSound with my non working aids, and now they BOTH work! If you are like me you have quite an investment in your aids, so to me, spending the $9.95 to ensure the circuitry of the aids stays dry and functioning correctly is a smart thing to do.