How long is the battery life?

In general, the battery life of two to five years. The battery life depends on the type of watch, size and power required for various functions. For example, the chronograph consumes more time than minutes, seconds and minutes. Some watches are equipped with a battery indicator: If the second hand beats at intervals of a few seconds, the battery needs to be replaced. Some special lithium-iodine battery life theoretically up to 10 years.