High voltage battery architecture

A power distribution system for an aircraft, comprising several electric propeller units (EPUs), includes a first paired battery pack, consisting of a first battery electrically connected to a second battery via a first high-voltage bus. The batteries are configured to power the first and second sets of EPUs respectively. The system includes a second paired battery pack, consisting of a third battery electrically connected to a fourth battery via a second high-voltage bus. The batteries are configured to power the third and fourth EPU sets of the EPU plurality, respectively. The first and second high-voltage buses are electrically isolated.