The Fitbit Charge 4 follows a pattern established by the company over the past few years, in that it doesn’t look all that different from the model it replaces – the Fitbit Charge 3, which launched in October 2018. When it comes to features, however, there are upgrades and they’re significant.

The first night I wore the Charge 4, it said I didn’t fall asleep until nearly 12:30 a.m., a half an hour or so after I dozed off. I must’ve been tossing and turning a lot. However, my oxygen levels remained pretty consistent. The second night, the Charge 4 thought I didn’t fall asleep until 2 a.m. Fortunately, you can edit this data in the Fitbit app, to more accurately reflect your rest. The Fitbit Charge 5 has a color AMOLED display, with an always-on option to make it easier to see stats at a glance in the middle of a workout (Image credit: Fitbit)The Fitbit Luxe has a vivid, high resolution AMOLED screen (Image credit: Fitbit) Features Smartwatch features Amp up your workout when you control music, like songs and browse playlists and podcasts from Charge 4. * Guided Breathing Sessions

The Fitbit app allows you to customize your Fitbit Charge 4, and view your health and workout stats (Image credit: Fitbit) The Fitbit Charge 5's screen is about the same size, but is a full color AMOLED, with crisp graphics and animations. It looks very much like that of the Fitbit Luxe, and may indeed be the same unit. It's a huge upgrade, and one that brings the Charge series in line with rival device from the likes of Xiaomi and Amazfit. Fitbit Charge 5 vs Fitbit Charge 4: Features Smartwatch features Both Charge devices will use a similar-size wristband, so Charge 3 owners who want to upgrade but like their old band will be able to easily swap them. All you have to do is press a button on the underside of the strap where it connects to the device. To avoid overloading you with information and putting you off Fitbits for good, this guide isn’t quite as exhaustive as it could be. Instead, here are some of the standout features you should consider before you buy a Fitbit: After four days of wearing the Charge 4, plus two half-hour runs using GPS, the Charge 4’s battery life was down to 24 percent. Fitbit Charge 4 review: VerdictFinally, to battery life, which is quoted at seven days without GPS and five hours of continuous GPS use. My experience so far is that using the GPS for short bursts of activity (20 to 30 minutes) every day gives around four days of use. That’s pretty good in my book.