Stinger is made to work with a specific 6S battery. Although any 6S would work if it fits. 4S is also supported but motor RPM and rate of fire will be limited (increase min. push duration here).

For Stinger V2:

Ovonic 6s 550mah 120C:

https://www.amazon.com/OVONIC-Quadcopter-Helicopter-Including-Batteries/dp/B0D2Y1T8LR

Gaoneng (GNB) 6s 550mah 90C:

https://www.gaoneng.shop/products/gaoneng-gnb-6s-22.2v-550mah-90c-xt30-lipo-battery-long-type

For Stinger V1:

Gaoneng (GNB) 6s 700mah 120C:

https://www.gaoneng.shop/products/gaoneng-gnb-6s-22.2v-700mah-120c-xt30-lipo-battery