A:AnswerCheck for unplugged/ disconnected plugs or wires and try to reattach them. See if it charges. Glue it back together. OR Throw it in the trash and buy something better. Or buy another one... We are living in the time of "throw it away" instead of repairing because <they> can make a new one cheaper. Good Luck
A:AnswerIt says it is but I haven't tested it. I had the older version and that one was not waterproof so I would be surprised if they didn't change that on the new one.
A:AnswerThe manufacturer says it can be immersed in water. However, I don't think I would try it out. We have had it on our boat when it starts to sprinkle rain and it has been just fine. We also rinse fresh water over it after being around salt water.
A:AnswerIf your device has Bluetooth, you can pair it. I use it in a truck at work that has no radio, paired to an IPhone 7, and I can here music very well. Talk shows not quite as well, but by moving it closer to me, I am able to here it. Now I’m half deaf from driving trucks for the past 37 years, so your results may vary.