My Macbook pro has to charge overnight to get an even usable charge (usually 50%), and when I unplug the charger from it drops to around 1-6%. I just replaced the battery and coconut app says its fine, charging with enough watts, etc. Have no idea what is going on.
Edit: should note, it only charges when off. When its on it claims its not charging. Unplugging the charger while its on causes it to drop or completely turn off.