Hi, @Daro77 the amount of time your Charge 5 battery lasts will, of course, vary depending on usage and, as with all rechargeable devices, will gradually deteriorate over time.
Although you have chosen dynamic GPS, if your Charge 5 is unable to connect to your phone’s GPS, it will use the built in GPS, which does have significant impact on battery. Make sure you have set permissions in the Fitbit app to allow it to use location settings on your phone. The Fitbit also needs to be connected to your phone and to detect that your phone is moving.
If I have used the built in GPS on my Charge 5 I do try to give it a top up charge as soon as possible afterwards.
Sense, Charge 5, Inspire 2; iOS and Android
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