Anyone use the B40 / A118C with a power bank? I just ordered the A118C not too long ago and was looking into one of those USB powerbanks. There are so many out in the market today that I am not too sure which one I should buy, and which one won't cause a problem with the A118C. I don't need a pass through, just a power bank that will power my A118C for 8 - 10 hours a day.