power one EVOLUTION Hearing aid batteries with highest energy density are the
result of consistent research work and ongoing development. Our expertise here
is based on the synergy of wide-ranging material research, many years of
experience in cell development and our own manufacturing plant technology. Our
newest development is the power one EVOLUTION, based on TFT (Thin Foil
Technology). It has a very high energy density, more capacity than our well-
established hearing aid batteries and therefore a longer operating life – by
up to 15%. Total of 60 Batteries and Keychain Battery Holder.