Can confirn 2x battery pack does NOT fit default back cover (at least with 9858102 variant), so, going to play around custom backplate like initially planned.
For the pack inside uconsole you don’t need overcharge protection board, as uconsole charger is supposed to handle it, but for dumb external chargers you may need single one for the pack. there are options on ali. Calibration as per here should handle the rest.