Bought a cheap emergency charger on the internet. It was interesting because it runs on two AA batteries so you can easily change them. That's why I got interested in it. It has a small led light which was very poor. And the charging function was not strong enough to use the phone at the same time because it kept discharging. So I was very dissatisfied with this one, even though it only costs 4 euros. Do not recommend this one, buy a good powerbank instead.