I hope you understand these examples. The examples are not 100% accurate, but they are very close. When it comes to battery life, it’s amazing. Battery life is determined by the position of the electron in the positive and negative poles. When the electrons move from the positive pole of the battery to the negative pole, the battery is charged and the electron is transferred from the negative pole to the positive pole. When buying a new phone, most companies charge a battery percentage of 50 percent pre-charged to balance the positive pole with the negative pole.