Start a eBay auction and start it at nothing/ low. Otherwise you could try taking out the internals and turning it into an actual working regular watch that would be pretty cool
No way past it. Some services can do it but it isn’t recommended. If your husband can contact the friend to remove the device then you can remove it otherwise your stuck with the parts
Could be a bad battery, I had a similar problem with a cheap replacement. With the battery health not showing that is apples own fault for anti 3rd party repair but maybe contact the people you got the battery from. Also check all the cables are connected correctly
Try clearing some files/ apps and check if your storage is full. Also close recent tabs and apps that might help. If they don’t then try backing up your files and performing a factory reset