Zinc air batteries are one of the most popular batteries for hearing aids. They are not charged, but powered. The sticker on the round batteries keeps them hermetically sealed. Removing the sticker will allow oxygen to enter the package and activate the batteries. Therefore, the sticker should only be removed when you want to start using the battery. After removing the sticker, you should wait two minutes before placing it in the hearing aid. Type (IEC/ANSI/USA/others): PR44, 7000ZD, 13, ZA13, DA13, blue Manufacturer code: PR44 Voltage: 1.45V (nominal voltage - 1.4V) Capacity characteristic: 360 hours. (discharging to 1.1V at 1500Ω; using 12h/d at 21°C ambient temperature and 50% relative humidity). Dimensions: 7.9 x 5.4 mm Attention! Do not store zinc-air batteries in the refrigerator! Store them in their original packaging and in a dry place at a temperature of 10-30℃. Do not store batteries in temperatures above 50℃, such as in a closed car when the sun is shining. In addition, you should not bend the package so as not to damage the insulating layer. Hearing aid batteries, like other types of batteries, should not be thrown into fire or burned. Batteries should always be inserted according to the polarity indicated on the batteries and the hearing aid. Do not heat the elements. Store unused batteries in their original packaging away from metal objects. If you have unpacked the batteries, try not to mix them up. Remove the batteries from the hearing aid if you are not going to use them for a long period of time and in unexpected situations. Do not disassemble or deform the batteries. Keep batteries out of the reach of children. Do not allow children to change batteries without adult supervision.