Got my new Phonak Spheres on order and patiently standing by until I get them. The audiologist there ordered a “Zephyr” brand hearing aid dryer (I have a bunch of similar ones). She says that I can put my rechargeables in it but only for about 20 minutes before removing / placing in the charger overnight. Still though, it makes me wonder if this’ll do damage. 
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It shouldn’t but make sure not to keep in in the dryer to long.