What to do if you end up with a non-working battery on your Apple Watch (38mm – Series 3)? First, you will attempt to charge it up a couple of times. If that doesn’t work, then you should know the battery is dead. And a dead battery is one of the most horrible things for any Apple Watch user. If the battery of your Watch stops working, the entire device would come to a standstill. But wait- it’s not the end of the world. You will only need a replacement battery here to handle the situation. Our replacement Apple Watch (38mm – Series 3) Battery (GPS) is everything that you will require here to solve the problem.