Like @Patruns said, the Aria scale doesn't have to go the the setup process after changing the batteries. You just need to replace the battery and the Aria will be.
Setting up your tracker on your PC (Windows and below) .. 4 .. 'unlock' icon on your Zip to put the battery door in place. Use the battery door.
Before you begin using your Fitbit device, you must connect it to your Fitbit account with a phone, tablet, or computer. Connecting your device.
If you're having difficulty charging your tracker, review these troubleshooting options. How do I charge my Fitbit device? Learn how to charge your device.
Totally agree -I'm in the middle of changing natteries. Do I have to do a full install all over again? I changed batteries got setup active then a bunch of step off.
Stepped on my aria this am and it synced. Saw batteries were low on the app, so changed them and stepped on it again. Aria said setup active.
I was very apprehensive about changing the batteries in my Aria read so many messages about having to reconnect to the wifi and set up.
Setting up Fitbit Zip on a computer. .. 'unlock' icon on your Zip to put the battery door in place. Use the Double-click the Fitbit Connect installation package. 5.