Most of the Mobile phone companies use lithium-ion batteries as the batteries of their phones. Using these batteries for years cause them to physically expand. this process is not reversible and the batteries lose their charge capacity and voltage as the number of charges and discharge cycles increases. When the technology improves, power usage increases automatically. We know it gives you all a little stress. So stop blaming your battery and start doing these few steps to save your battery life. 01) The first thing you can do to save your battery life is by Controlling battery discharge.