Recently, I have been having battery issues. I lost the 61W charger that came with my Macbook several weeks ago, and in the mean time used a 12W iPad charger. This didn't work fantastically well but I did not expect it to.
Since I have found the original charger, it does not appear to be working any more. There is no apparent damage to the charger (although I did buy a new cable, since the original was discoloured).
Therefore, it did not seem that there was an issue with the charger.
However, my Macbook has still been charging slowly and, according to the System Report, it is only receiving 12W. This is despite using the original 61W adapter and a new 60W cable.
I've tried turning the Macbook off and on again, as well as resetting the SMC, with no effect.