One Full Battery with the Instinct E - 45mm

From 100% to 0. Everyday wear, sleep tracking, workouts, and Pulse-ox OFF. 16 day estimate - Total 13 days with workouts. All in all, if it's 100 bucks like mine was, then totally go for it. But I wouldn't recommend buying this watch at full price, nor as your only Garmin. Lack of solar charging is a bummer but not a huge deal, no flashlight is too bad but not a deal breaker. No dual frequency GPS and no triathlon mode is just Garmin cheeping out. Get an Instinct 2, basically same same but better (despite it being older). The Instinct 2 at least has training status and triathlon mode.