Hopefully mods will start to use usb c over usb b/micro in coming 12 months.....
ye olde usb b & micro usb has just one pair of power 5v gnd pins to recharge
usb c has 4 pairs enabling faster transfer of power/data to be transmitted
(plus plug it in anyway up - the pins are mirrored)
Of course faster transfer is dependent on leads used plus the circuitry/tracks on pcb
plus specification of device/battery being recharged etc......
These days we are getting more & more power crazy & more impatient when recharging
thus we want our shit recharged faster with more power surging through leads which weren't designed for it
I'd try to stagger "hungrier" devices than try to charger two greedy bastids at once if possible
say a mod & maybe a fone or something ??? than 2 greedy mods
ensure you use good quality leads, with thicker awg wires that can handle the power and recharge quicker
but be careful as the internals, the pcb tracks & device's power cell itself has its limits too
Braided Anker usb leads are highly regarded for whippy recharging
but be very careful you don't push the dated device that was really designed to be charged at 0.5a to 1.0a max
simply apply basic common sense until they update the usb connectors in the vaping industry....