I have a Great vigor v2 series WRX. it has a .15 engine and is 2 speed. My friend also has the exact same car and, one night, while driving them both together, my batteries died and my car was out of my control. Luckily i was able to chase after the car, stop it, and prevent any damage, but i am now concerned that it will happen again and next time i might be going too fast to stop it; and it will crash.
Please reply with ways i could prevent crashing my on-road nitro car regarding battery life.