I have just brough Canon 600 Ex-Rt ( External Flash Light ) and a Power Bank.
And I have tried out the flash with/without using the Power Bank. And I find no different!
The flash didn't recharger faster/last long with the power bank.
Or is there any indicator at the screen of 600 EX-RT show that is using external power bank?
I cant find the answer in the internet. Please help. Thanks!