need help w/ lipo on stock electronics (micro-t)

[marc19]

i installed a thunder power lipo battery with 350 mah with 18c cont/ 26c burst (6.3a cont/9a burst) hoping to get extra runtime and speed on a modified micro-t chassis but motor stalls after 10-15 second of running, steering servo is working but the motor is not. I tried disconnecting and connecting the battery and motor starts running again for the same period of time and stalls again. does it have something to do with the motor getting hot or my battery/esc are not compatible? btw, i'm still using the stock motor and reciever/esc combo. this is getting frustrating coz nothing is fried i believe. your advice will be appreciated. thanks alot