I encounter the following issue:
Having multiple batteries linked together on side 1, multiple batteries linked together on side 2, when charging the side 2 with a standard "converter" > "junction" > "converter" setup, the side 1 get drained continuously, despite side 2 batteries being fully charged.
I reproduced the issue in creative as you can see in the screenshot.
All 4 batteries were freshly spawned 1 minute earlier, and the only powered device is the lamp.
I tried with one battery on each side, but did not faced the issue
Just tried with one battery on side 1, two batteries on side 2 and still face the issue (3rd screenshot)