apple watch won't start after long time unused
I have an Apple Watch Series 1 which has sat in a drawer for a couple of years. I've decided to give it to my 11 year old son but it doesn't want to switch on. When I charge it just the apple logo shows up but never goes beyond this point. I've tried the 10 second hard reset but at best it shows the red message to go to the help page with an exclamation mark.
Is this retrievable or has the battery completed died?
Thanks
John
Apple Watch