1. If the battery is a long time (several months) do not, remove the saved backup from the machine. Recommended that each month and a half or so once the battery discharge and Mitac bp-8x99 Battery charge order to improve the state of your battery to increase battery capacity. 2. If the battery is not a long time, it should be set to charge 30 to 50% in stocks, it is recommended to charge the battery about once a year, and its power set to 30 ~ 50%, to prevent excessive discharge and damage the battery. Dell d400 Battery The battery is set to 30 ~ 50% of the specific methods of operation are as follows: When the battery charge is greater than 50%, power consumption can be switched to 30 to 50%. If the power consumption of less than 30%, the first switched power to the 3% to 100% recharge and then switched to 30 ~ 50% of power can be.