If an eskate battery has dead cells will the voltage read normal?

My board wont fully charge. It only take about 65% and the my charger flashes red and green. I just took voltages of the charger, the charger cable that goes to the batter, and the battery. They all read normal. I want to say the batter has dead cells, but im curious. If a battery has dead cells, will the voltage read normal. The voltage range for the batter is 36-50.4 and it read 42.5.

batts can have a surface voltage that sags under load