The weather has been terrible lately and I was expecting to fly over the weekend but it was too windy and wet for that. My batteries were pretty low and I didn't want to keep them stored that way for long. I moved the switch to "storage" on the charging hub and was expecting to have the lowest charge battery charge first and the higher charge batteries wait, similar to what happens in "charging" mode. Instead, all three of the batteries were charging simultaneously. That was a pleasant surprise. 
