Phantom 3 Professional Battery Failure when I was over 50% battery level

Thanks i didnt know there was a search tool i found it. Im old school so this is all new to me. Never had a drone before and i just bought one, suppose to be here next week so i hope i can run it. Im a little shacky with electronics so i thank all of you for your help i will probably need it.
 
I wonder if you would put electrical grease on the batt. Connections if that would help?
 

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