First, charge it over 10 hours at the first time before using.
Second, when the power is not enough, the power shortage light will turn on (green). Please change into normal voltage. The battery has to be charged after using up.
Third, if the battery will not be used for a long time, charge 10 to 12 hours first and then keeps it, After that, if has to be charged in every two months: charge tine should be over 10 hours.
*the battery will broken down (or can not be charged) if you do not follow the above steps. Battery is belonging to the consumer product, it is out of guarantee, The user has to take up the responsibility for the misuse and mismanaging