MaxAmps 800mah 3.7v Battery for the Syma X5C / X5C-1 800mah capacity, 1S 3.7 volts True 40C, 5C fast charge capable Built with pictured JST Red Male connector for plug and play 61mm X 25mm X 7mm, 23 grams, Perfect fit in Syma X5C and Syma X5C-1(just remove the plastic nub at the rear of the battery compartment) Lifetime warranty, Built today with factory fresh cells