Watches are worn for a variety of reasons including knowing what day it is, making a fashion statement and ensuring you’re on time. Today’s watch selections come in a large selection of prices, colors, shapes and sizes, but they all rely on one thing — battery power.

The capacity of your wristwatch battery is generally measured in milli-Ampere hours (mAh). This indicates how much power the battery can hold. The higher the mAh rating, the longer run time you can expect to receive from your timepiece.