@Thomas-Eiszler , As long as you dont actually have the APM connected, having the power manager driver enabled in PX4 will not conflict with the mini ESC also reporting battery_status. This is because even though the APM driver in PX4 will attempt to start, it will fail to find the actual hardware device (via i2c probe) and will exit the driver. However, it is best to disable the power manager (APM) driver.
Starling 2 MAX uses two 2-cell packs in series, so it is a 4-cell pack.
when you run voxl-esc spin test, it should report voltage reported by each ESC. Does that match the actual battery voltage or is it also wrong (as is reported in your battery_status ?
Alex