B240 with B230/300

Has anyone tried the P090D to DC709 cable?
What are the benefits? Can we charge both through one connection? Do we really share the wattage? Does the monitor on EB240 provide status on both batteries?

“Has anyone tried the P090D to DC709 cable?” - Yes, EB150 to B300 battery. Also works with my AC200P.
“What are the benefits?” - 50 plus volts into EB150 for 400 plus watts of charging, don’t remember the exact watts or volts.
“Can we charge both through one connection?” - Yes, hook charger up to B300 battery while EB is plugged into it.
“Does the monitor on EB240 provide status on both batteries?” No, but the battery has state of charge lights.

I purchase a B300.
I used my EB240 to about 20% of battery capacity. The cable from the B300 recharges at about 450 watts!