I seem to have run into a problem with powering Arduino from a power bank (external USB battery). Arduino seems to be running fine for 30 s, then the power bank switches off. This happens with two power banks: Yoobao YB-659 (maximal discharge current 1 A) and Maxell MPC-R5200BK (maximal discharge current 2 A). My setup consists of an Arduino Uno, a data logging shield, a temperature/humidity sensor, and an LCD display (whithout the background lighting); all in all, it should be WAY beyond 1 A. Both power banks can successfully charge a cell phone, a e-book reader etc. What is going on?
My guess is that in addition to maximal discharge current, power banks also have some minimal discharge current, and shut off if the discharge current is below this threshold. They treated my Arduino as "leakage" and shut off. Does this make sense to anybody? Can somebody recommend a solution? Ideally, updating a firmware of the power bank... :)
Thank you in advance, Primoz