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Hello @Fitness222, have a warm welcome to the Fitbit Community, it's great to have you on board. 
To clarify, is your Charge receiving Notifications and you want to remove it or do you want to remove in-app Notifications? If you'd like your Charge to stop receiving Notifications, go to your phone Settings > Bluetooth and check if your tracker is on the list of Connected devices. If it is, tap on it and select Forget this Device. This will remove Notifications.
If you want to remove in-app Notifications, I'm sorry but currently these can't be removed. I understand your concern and went ahead and found a suggested idea from @LZeeW to implement this feature in a future update. Feel free to vote and comment on it, this is the best way to make your voice heard.
I hope this can be helpful, if there's anything else I can do for you, please feel free to reply.
Best Answer