I had a charging problem with my Samsung Note 2014 edition. It started taking about 2-3 days to charge and discharged in about 20 minutes before the fix. Now it charges fully in less than 2 hours and lasts about 8 with heavy usage.
I am not a professional repair person, but I noticed when I took the back off of the tablet that the ribbon cable was loose. I removed the back to get the numbers off the battery because I assumed my battery was bad and I was going to get a replacement.
The ribbon that I am referring to is the wide one that comes from the charging port and across the back of the battery and into the motherboard using a flip bar type connector.
I thought it wouldn't harm the tablet to try to make the connection tighter. So I raised the flip bar and pushed the ribbon in further. Replaced the cover and it charged quickly.
A couple of weeks later I ran into the same charging problem. When I removed the back, the ribbon cable was loose again. I decided to hot glue it into place (avoiding the circuitry of the motherboard). It's been fine for a few months now.
P.S. My tablet came with the white 2.0A charger. It worked fine initially, and it works fine now that I fixed the cable.