Wearables ranked by battery life

94 watches, rings and armbands, longest first. The number is days per charge in normal smartwatch use. The GPS column is hours of tracking, and wherever the maker names the mode its figure was measured in, that mode is printed beside it, because they do not all mean the same thing by it: one brand leads with its most accurate mode and another with its most frugal one.

Ranked here: the devices you wear and charge. Scales, blood pressure monitors, chest straps, the handheld and the sleep mat run on coin cells, AAA cells or mains power, so days per charge is not the same unit for them. They are listed below the table in the form their maker publishes, never converted.

Every figure on this page is the manufacturer's own claim, taken from official spec sheets and support pages. It is not my measurement. Real battery life depends on the display mode, how much GPS you use and how often the device syncs, and an always-on display typically costs half of it. The mode printed beside a GPS figure is the maker's own wording, not a shared vocabulary: two brands can use one word for different modes, and different words for the same one. Read both notes before comparing two numbers.

Measured in months, or in hours of use

19 devices whose battery is not counted in days per charge. Left in the maker's own unit rather than forced onto the scale above.

All 113 devices in the comparison