I finally solved this issue after soooo many google searches. When I reinstalled the battery - the ribbon was on backwards than what appears on most videos. Check the batter ribbon placement. I thought the same “ooo Its an old battery” so I waited for a replacement. Replacement battery had the same issue of “Charging, Please Wait” It wasn’t until I flipped the ribbon before my fixed ipod Gen 6 started to work again (I am using iFlash Quad)