The Renata Battery 393 are great quality batteries for digital devices, calculators, watches, memory and computing devices, medical equipment etc that support button sized batteries. These batteries are made using fine quality silver oxide, which ensures that they do not self-diffuse and their power remains intact for a long time. These batteries retain their power even when the device is not used for a long time. The operating temperature of these batteries can be anywhere between 0 degrees to 60-degree Celsius.