wpl d12 , d42 battery 600mah 7.4v li-ion 14500 10c.   I have never used this battery, i don't need it   it has 10c rating so its good for wpl d12 , d42 and E-1   but will work in c14 c24 c24-1 c34 c44 c54 b1 b14 b16 b24 b36 along with many other 2s capable RC vehicles