i don't think you can charge via powerbank.
going full charge on your battery plus the spare AAA's will last you the whole day.
2 AAA's capacity is about a third of the grdiv's battery
based on my personal experience, went around hk for a whole day about a year ago. it was about early morning till 9-10pm my grd battery held up very well.
Hi, may i know roughly how many shoots you can have with AAA batteries?
so which mean AAA batteries only can last about 1/3 of grdiv's battery?