slow charging

I have MacBook Air (13-inch, Early 2015) and now is very slow charging. I read a forum and said that by doin SMC will fix the issue. I read the instruction here https://support.apple.com/en-us/HT201295 .

My question, my macbook air categorized under which a 'Notebook computers with a battery that can be removed ' or 'not'?

Because I have performed SMC and without removing the battery , it doesn't fix the issue.? my macbook still slowcharging?

Please help..