To service the battery your self you have 2 options.

One is to completely discharge the battery (to reset the indicators), by letting the computer run until it shuts off.

Second is to reset your SMC that reports the battery state to the system.

Last no least, your battery seems to be EOL anyway (after 4 Years)

To service the battery yourself.

You have 2 options.

One is to completely discharge the battery (to reset the indicators), by letting the computer run until it shuts off.

The other is to reset your SMC, because that reports the battery state to the system.

Last, but not least, your battery seems to be EOL anyway (after 4 Years)