As many of us have experienced, a laptop's battery life (i.e.: the power storage capacity) plummets after a few years of use. This is often not because the battery itself has aged, but because the BIOS system of a laptop misjudged the battery's power capacity during a number of charging and discharging processes. In this case, don't be in a hurry to sentence your battery to death. Instead, we can make a battery's power storage capacity fully restored through "battery calibration" this simple yet effective method.