英语翻译If not fully charged,the battery will automatically char

英语翻译
If not fully charged,the battery will automatically charge when the power unit is plugged into mains power.The battery will charge at the optimum level depending on history of previous mains power usage and charging over the previous week.
这是E文的有关电池说明的一部分 求逐字逐句高精度翻译用,在线翻译器翻译的不要 翻译好的大赏!