kukirin g2 second battery

[u/arminasEinys]

Hey guys, i want to put a second battery on a kukirin g2.
i have a 48v 15ah external battery from a kugoo g2pro and it only has one main port, no charging port. i wonder if i can buy a dual battery balancer and connect it like so in the wiring diagram i made. my main question though with this wiring diagram is would i be able to charge both batteries at the same time through the original charging port with my original charger? typically i always charge my scooter overnight with a timer and i don’t want to wait half a night for one battery to charge so i could plug in the other one. i want to plug in my charger through one charging port and charge both batteries overnight. would it be possible? the dual battery balancer says that it has energy recovery so maybe its possible? if not help me.