Hey, I got three things I need help on. 1) I would like to use a 7.2 4200mAh batter to either charge, or extend the life of cell phones battery. 2) I would like to make a home made charger for a li-po battery thats rated at 11.1DCV. Any help on that would be greatly appreciated. 3) I would like to know if it is any way possible to make a devise that will boost a cellphone signal. The max voltage I would use is about 12DCV. Is this possible? How and what do I need?