Cellphone no power and not charging

This happens when you don't charge your mobile of a long time . the solution i am providing is bit tricky take out the battery out of your mobile phone and take to electric wires and one 8 volt battery the one has two terminal on the top and has rectangular shape . attach the two piece of wire with the batter terminal and then attach the two wire to the batter of the mobile for few second and then attach the battery to the mobile phone and charge it with normal mobile charge ... and its done .. and even then if the problem exist try to change the battery