I had the exact same thing recently. It can be indicative of a battery problem. In my case, I let ran the battery down too much because I was trying debug the audio interface I was installing. I've also read in other threads where someone's battery was failing and he got the same icon.
Audi R8 V10, 6MT, Ibis White
BMW i3 REx Mega, Laurel Grey
[Retired] BMW Z4 sDrive35i, BMW 335i Coupe