Either way will matter very liitle in the future. When you get you device it will have about 80+ % power from what most have said. Just use it and charge it tonight when you sleep.
Just put it on the charger every night and do not worry about it.
I got my replacement from Apple today so thought I would ask. The back of it looks to have a couple small scratches on it. I don't think it's a refurb though.