Miniature zinc air batteries are primarily designed to provide power to eyeglass, behind-the-ear, and in-the-ear miniature hearing aids. In most hearing aid applications, zinc air batteries can be directly substituted for silver oxide or mercuric oxide batteries and will typically give the longest hearing aid service of any common battery system.
Highest capacity-to-volume ratio for miniature batteries.. Relatively flat discharge curve. More stable voltage at high currents than mercuric oxide or silver oxide miniature batteries. Essentially constant internal resistance. Activated by removing covering (adhesive backed tab) from air access hole. Most effective in applications that consume battery capacity in a few weeks. Must have access to air (oxygen) to operate. Nominal voltage of 1.4 Excellent service maintenance prior to tab removal. Available in common hearing aid battery sizes.
The electrodes in "Air Cell" batteries are gelled zinc powder anodes and catalyzed carbon cathodes. A hole in the battery container allows oxygen from the air to enter the cathode and be reduced on the carbon surface. At the same time, the zinc in the anode is oxidized in the same way as in a miniature mercuric oxide or silver oxide battery. A cutaway of an "Air Cell" battery is illustrated in the following diagram:
( mAh )
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