Ecoflow Delta 2 charging and discharging

When using the Ecoflow Delta 2 and backup battery, which unit will get discharge first and which one will get charge first.
So I ran a quick check. Initially, both units get discharged about evenly, then the main unit get discharged more. In charging, the main unit will get more of a charge than the backup battery.
This setup is in my basement so I explore options to recharge the delta 2 including installing a transfer switch to allow back feeding of the AC wiring from the solar inverter and battery bank from the garage to the basement.
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[@ljli]

ok so for discharge, main battery discharges first. For charging, the main battery gets charged first?

[@wtam69]

Correct. But both get charged back up to 100%.

[@ljli]

@@wtam69 Thanks so much for making this video!