Two sizes available, 4kwh is the standard size and is what comes with the SP140 by default, and is the 1hr flight time pack (The recommended size for high thrust setup, or heavy tandem flights). The 2.2kwh battery is the half-size option. The 2kwh battery is 15lbs lighter and 1/2 hour flight times.
Current shipping time end of 6/2022 for 4kwh pack 2.2kwh pack is out of stock next shipping 9/2022