Remove the drained battery from your device. Make sure you are sitting down with your battery pack and a pair of scissors, ideally over a table. Carefully use the scissors to cut and open the pack and access the hearing aid batteries one by one. Think of this as like cutting a slice of a pie. Power one WIRELESS approved means hearing aid energy with premium performance and longevity - as usual with the well known stable high voltage of power one. All our proven zinc-air cells are and remain mercury-free. power one thus lives up to its claim of being the most environmentally friendly hearing aid battery manufacturer.