When you get your failsafes you will also want to get hump packs, most failsafes wont work on regular alkaline batteries, tower hobbies has a really nice one that a lot of people have got for their warheads it can be found [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFJT1&P=ML]here[/link]