New smartphone arriving? Do you know how to correctly initialize your Li-ion battery? Don't worry, just follow this simple guide. First of all, it's not true that your new battery needs to completely discharge and then it must be charged for 10÷16 hours. These two steps are the worst ones you can do. According to batteryuniversity.com , "each chemistry has its own requirements", but "there are common denominators". As you can read at batteryuniversity.com FAQ on How to Charge and When to Charge , it's advises to apply a full charge before use the battery. So, don't boot your device with your new battery ! Battery is not ready to work yet. However, we don't know if manufacturer used the battery of your new device and, in order to avoid any percentage problem, I think your battery need this initialization.