Each time a battery is charged and then discharged (a.k.a cycled), by-products build up inside the cells resulting in an increased internal resistance. Little by little as this resistance builds up over time, it prevents your battery from being fully charged and your run times will decrease. It is important to note that over time, all rechargeable batteries including Max Capacity, gradually lose their ability to hold a charge.
One of the main things that can be done to slow this process down is to buy a high quality laptop battery that has a low internal resistance. All Max Capacity laptop batteries use cells designed to build up internal resistance slower. Our Max Capacity laptop batteries excel in this area and retain nearly 70% of their capacity even after 500 charges. This far outlasts most others!