App draining the battery on my phone.

[christophe-US]

upgraded from fitbit charge 2 to 3.

Same settings.

It now drains my iphone in just 8 hours.   It looks like the background process consumes lot's of power .  I have all-day sync, just like on my fitbit 2,  but no issue there.

Moderator Edit: Clarified Subject.

[MarcoGFitbit]

Hello @christophe-US, I hope you're doing well, it's nice to see you around the Fitbit Community. 

I appreciate your participation in the Forums and for sharing your experience with us. Tell me, have you restarted your phone lately? Have you updated the Fitbit app? We haven't received reports from this happening with the app but I would like to gather some information from you so we can check this further:

• iPhone model you're using. 
• OS running on your phone. 
• App version installed on your phone (go to Account > Help to get it)

Thanks for your patience and understanding, we'll be waiting to hear from you. 

[christophe-US]

I have used Fitbit charge 1, HR, 2 and now 3 for about 5 years. This is
something I did not have issue before.

* I restarted my phone about one week ago, I am restarting it now to
see whether it will make a difference in the next few days
* The Fitbit and Fitbit apps are current (2.86 (810))
* I am using an iPhone 7 Plus
* When I look at the battery usage, Fitbit comes first (19%), mostly
background activity, ahead of mail or home and lock screen.
* All day sync is turned on, as well as background refresh. If I
turned these off, the power usage drops. But I had the same settings with
Fitbit 2 and Fitbit power usage was typically 2%.
* GPS is disable for Fitbit.

Moderator Edit: Removed Personal Information + Format.

[MarcoGFitbit]

Hello @christophe-US, I hope you're doing well, thanks for taking the time to reply with the information requested. 

I appreciate you have come back. At this moment, I've forwarded the information you provided to our team so they can take a better look at this situation. In the meantime, when you're not usning the Fitbit app, please force-quit it. 

Once we have more information to share with you about this situation, we'll make sure to post it here in the Official Forums. Thanks for your patience and understanding, have a great day.