charging problem

tl:dr charging port issues and battery issues. I bought a used SPro 3 back in May 2017 to replace one that had a cracked screen. It has worked great until last weekend when someone tripped over the charging cable and it was forcibly removed from the unit, and now has the plastic shielding...

Does anyone else have the problem where the last 1% of charging takes forever. it gets stucking saying 1 minute left but just hangs there for a very long time. Is this a sign of a faulty battery? I have the surface pro 4, i5, 4gig, 128. It has been stuck on 99% for 20 minutes now