Price: Smartwatches can range in price from relatively affordable to very expensive. Consider how much you are willing to spend before you start shopping. Battery life: Smartwatch battery life can vary depending on your use. Some smartwatches can last for a week or more on a single charge, while others may need to be charged every day. Compatibility: Make sure the smartwatch you choose is compatible with your smartphone. Most smartwatches work with Android and iOS devices, but a few exceptions exist.