Battery life could be better - Fitbit Flex 2

Battery life could be better - Fitbit Flex 2

I got about four and a half days of battery life on a full charge when wearing a Flex 2, which isn't great. At Day 3, the app gave me a low battery warning. It died the next day, but I didn't know for almost an hour. There was no vibration, or final warning. I went to sync and nothing happened. That's an easy way to miss out on steps, which is frustrating.

Sarah Tew/CNET

Fitbit claims you should get five days of battery life, which would be fine for a more advanced device, but it should really last longer. There's no display or optical heart-rate sensor, two features that put considerable drain on a battery. And considering how the Flex 2 just drops out without warning on low battery, I'd want to charge mine the moment I got a low battery warning, and not risk it.

I expected the Flex 2 to last a full week or longer. The Jawbone Up2, which was an old favorite of mine, managed to get a week. So do most basic fitness bands without displays.

Charging is also annoying: The Flex 2 comes with yet another proprietary and totally different charger from every other Fitbit. You have to remove the tracker, which is an extremely tiny little stick, and insert it into a small dock. A full charge will take up to 2 hours.

Sarah Tew/CNET

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