Fitbit has a 365 day warranty from day of purchase. If your item is within the 365 day warranty period and they determine there is an issue with the battery, they will send you a replacement device. Go to Fitbit.com and have a support chat. They will need your fitbit email address as they will check the sync data on your device and they will be able to determine the original sync date which they will use as the start of the warranty period. If you are within the 365 days and there is an issue, you get a replacement device. If it is out of the warranty period they will give you a 25% discount code on the purchase of a new device. There are no repair centers and not sure if anyone wants to run the risk of fixing for you. I know I don’t want the responsibility of having to answer for my workmanship if something goes wrong with the battery replacement and it happens to leak/blowup on your wrist.