Can I measure the battery is working?

Not really understanding why you want to make this so hard.

With the battery properly installed you can measure the voltage directly off the logic board.

If you don’t want to take the system a part and the system is not responding you can test things using a USB-C power meter which I often do.

If you are testing a collection of batteries and you have a junker logic board you can cut off the power connector area and hard wire some test leads to it to connect to a meter. I did the reverse getting a dead battery talking off its logic board so I could attach it to the logic board when I’m working on it.