Been using Phonak VSP aids for years, and recently Phonak S+ SP from the UK NHS underthe name of Nathos.
I remember the size13 battery lasting nine or ten days before getting the dead Beep. Bythis time I was struggling to hear properly, and now change batterieson the eighth day just before distortion gets too bad.
I use Rayovac size13 310 mAh, but having been told years ago, that the zinc airbattery holds full charge until it dies, doesn`t seem to hold waterany more.
Reading some of yourposts, it appears the newer aids are a little power hungry. I thoughtthe nano technology used less power! Any thoughts please.