Powerbank recommendation?

If you use a powerbank for your Shield which one can you recommend?

I tried an Aukey Quick Charge 2.0 16000mAh but when charging the k1 the stereo speakers make a high pitched noise. :(

I tested a Power Theory 10000mAh and this one works fine. Downside, only 1A input.

Next I'll test a Quick Charge 2.0 by Anker.