I was flying my Mini 3 pro today. When I was in sport mode, I got a extreme voltage warning, and it said land immediately. I was over the ocean, so I couldn't land. The battery was at 50%. So I did a RTH. Then I flew manually so I could stay over land in case it crashed. So this warning stayed on. I finally got home and landed. Then in said overheating warning and shut down. I've had other warnings, like over current. I should of marked the battery so I would know if it's only one battery that has a problem.