Sustainabilityĭespite publishing a sustainability statement, Fitbit declined to answer any of the Guardian’s sustainability questions, including on the use of recycled materials, whether the watch is repairable and the costs to do so out of warranty, and battery lifespan, losing it a star. The watch connects to the Fitbit app on your Android or iPhone via Bluetooth, but also has wifi for downloading updates, apps and similar. A 26-minute run with the screen on and GPS active consumed 6% of the battery, meaning it should last the length of a marathon or so.

I had to charge it before bed every other night with everything turned on, running a couple of times a week, tracking walks and my sleep.

The battery can last up to six days between charges, but lasts more like two with the screen on all the time, calls and notifications turned on, and using some of the more advanced health monitoring features. The watch charges to 100% in 77 minutes or 50% in 26 minutes with a small magnetic USB-A puck that clips to the back.

Fitbit sense 2 review