yesterday we had a scheduled power cutoff, so I tired some new tricks.
I tried powering my router with a stack of 9 rechargeable AA, but it is a no win situation. Router draws a lot of current, 0.7A, and soon voltage dropped below proper functioning. 10AA may be too much
Also lighted our dark bathroom with a USB bulb. Had the chance to measure my powerbank's stnadby current draw.