The Zenoah G-20 ignition really eats up a battery, make sure you use a higher capacity than normal. I'd recommend an 1800-2000mah. The small pack AA batteries are available in Ni Cad and NIMH. A normal size pack is 100-1200mah, but the G-20 ignition will eat that in a couple flights. This has been noticed on several G-20's at the field.