Mister Battery helps you calculate each charging detail for your device. With different chargers and charging cables, your devices charging speed varies greatly. Using the Mister Battery, we can help you find the best charging device combination! Mister Battery provides the following features: 1. Measure the maximum watts of the current charging system, the number of milliamps per minute charged. 2. Record the duration and effect of each charge to help you compare the results. 3. Calculate the speed of each charge you got. 4. Check if your device supports PD(Power Delivery) . Find your best charging device and let your battery charge up!