Hello @ingmarie
This help page (<-- click) has the steps to follow to turn on notifications from your phone to your Fitbit. Follow the same instructions to turn off the notifications that you don't want. There are also push notifications that you can disable:
About your rapid battery loss, when my Charge 5 started having rapid battery loss, I restarted and recharged my device multiple times over several days. As soon as I saw a rapid drop in battery, I restarted my Charge 5 and put it on the charger until it was back to 100%, often doing this multiple times in a day. Eventually, this process got my device "unstuck" and the battery went back to lasting 6-7 days. Although there's no guarantee that this will work for your Charge 6, it might be worth a try.
Rieko | N California USA MBG PE
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