With multiple batteries and extended schedules keeping me away from home base on some shoots I took a hard look at my charging options to minimize the time my aircraft would be grounded waiting on its 'tanks' to get refueled. The
4 port Hub was a contender until I read the specs. To get fully charged batteries, i.e. 100%,
there was no reduced charging time for multiple batteries connected to the Hub. Specs are 4 fully depleted batteries take 4 hours and 40 mins to charge. That is the same as 1 hour 10 mins per battery when charging one battery at a time on the single charger. The hub charges only 2 batteries at a time but the entire time for two batteries to fully charge remains at 2 hours and 20 mins. The equivalent of one battery at a time charge rate on the single connection.
EVO 4 Port Charging Hub
The only logical way to reduce you refueling time in the field is to purchase the car charger and a cheap 200 watt DC/AC inverter that plugs into the cigarette lighter socket on the vehicle. With your AC charger plugged into the Inverter in one vehicle socket and the car charger plugged into the other dashboard socket I am charging sequential batteries faster than I typically need them for the next flight plan or shoot. IOW, I start charging my first of 3 batteries as soon as it cools down while I begin flying on the 2nd. By the time my 2nd battery shoot is complete the 1st battery is over half way charged at the time the 2nd begins its charging on the other unit. Enter my 3rd battery and flight time and before that #3 has been used up my first battery is topped off and ready to use again and #2 is half way charged. Never running out of fuel for the drone, even on a lengthy all day shoot as long as the vehicle is within "reach."
Financially the Hub is $79 and the car charger is $65. The $14 savings can be applied towards the 200 watt inverter which even comes in handy for charging your cell phone, tablet or running your laptop while on a road trip. A 200 watt inverter is only $22 on AMZ. I personally run a 400 watt Inverter than can power my 27 inch iMac right in my truck for on the spot previewing or editing if needed.
I have run my Killa Watt meter on my AC OEM single charger and the output is only 56.7 watts when charging the drone battery from discharge level and the HUB will only receive that much power from the charger for the connected batteries no matter how many are attached.
The AC charger label states "Maximum Output 50 watts." I was getting 57. However if you begin charging the RC controller while charging the battery, 20 watts will be used for the RC initially leaving only 30 watts for the drone battery.
Just something to think about if you find yourself in the position of all day shoots and many flight plans or missions to accomplish with a smooth work flow and minimum down time.