If the bladder tank doesn't have the air in it that it needs, then you'll be eating up more electricity with the well turning on and off more frequently.
If you can, put a pressure gauge on the water system somewhere. Take a reading when the pump stops and again when it starts. Measure the volume of water between off and on. That should tell you something about the condition of the bladder tank.
There's a difference between fixing something that is broke and scheduled maintenance.
