Valkiri 2 used a 4S 8000mAh monster to power everything.

Valkiri 3 went for a 6S 3300mAh pack for weaponpower and a 4S 2700mAh pack for the drive.

Both used the NTM 5060, a motor suited up to 8 S .

6S because the ease to find cheap packs and chargers and the fact we use the cheap SS190-200 ESC, what in theory should do 7S.