Thanks to kalleh and hairydog,

Exactly that was the problem. The apk. "Ampere" was a big help! At home i have 800 mA with 220V charger und in the car with 12C charger ONLY 20-100 mA.

I bought the first new charger, but the largest surprise was the cable. Of all 8 cable that I had 4 discard garbage. With apk.Ampere I checked very easily in shop the cable and charger. And as always quality costs money.