The Fitbit Sense 2 is rated for 6+ days of battery life, but many owners are seeing their watch die in 1–3 days — or even within hours after a firmware update. The most common culprit is the SpO2 ...

The Fitbit Charge 6, the latest addition to Fitbit's lineup of fitness trackers, has introduced a significant advancement in health monitoring with its built-in blood oxygen saturation (SpO2) feature.