?? ???? ????? ??? ?? ???? ??? ??? ??? ?? ??? ????? ? ?? ?? ??? ????? ????.???? ???? ????? ??????? ??????? ??????? ???????? ????????? ?????? ?????These types of method of electricity era is Utilized in batteries. Batteries can be of two kinds i.e. Key battery and secondary battery. The primary batteries aren't rechargeable & it may’t be made use o