Henry's Hearing Aid Tip Hearing aid batteries no longer have mercury in them. This means that they need time to "charge." When you take the tab off the back of the battery, you need to let the battery sit outside of the hearing aid for 1-2 minutes. This allows air to enter the holes on the back of the battery and mix with the zinc inside the battery. The zinc and air must mix for 1-2 minutes for the battery to achieve a full charge. This will make your batteries last longer.
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