Q: Is it good to charging mobile phones when it's on?
A: A lot of customers asked such question. And the answer is "no". Because when the mobile phone is on, it means it's discharging, and charging represents it's supplying power for the phone, so it's charging and discharging at the same time, which may lead to voltage chaos, and then the circuit board inside will get heating. It may also cause instant current backflow If ther's a phone call when it's charging, which may damage the components inside. As time passes, the mobile phone and the rechargeable battery inside will not work well anymore, or even can' work.