I have the exact same laptop and the exact same problem after more or less 2 years of use as well. Last week I was watching a movie on the laptop while on battery. Half way the laptop shut down and I had to connect the cable. Later on I found out that the laptop is firstly at 67% not charging state and then after I tried to calibrate the batter at 0% not charging. Last time that I used it was 3 days before it worked well for an hour or so which is also quite low regarding the capabilities that I had normally. Now it won't even stay alive for a second. The moment I remove the cord the laptop dies. Even my 10years old laptop can sustain itself on battery for a few minutes before dying. So this has nothing to do with drained capacity.
As said this laptop has the battery inside where it is not easily accessible but I have managed to open the case and unplug and replug the battery. Nothing changed though.