I watched a clip yesterday that talked about recycling power on Mac laptop to increase the lifespan of the battery. I used coconutbattery to check the capacity of the battery and it says 86%. After following the instruction - Charged the battery to 100%>>Unplugged the power source and run the battery down>>Allowed the battery for over 5 hours>>And then started my laptop again. When I used the coconutbattery again, the capacity of the battery dropped to 74%. So what is the problem?