@Fraz1112 one thing to be concerned about is if your ESC has a LiPo cut off feature or not, and in your case it looks like it does.
Otherwise you'd want to get an external low voltage alarm, which isn't a bad idea to have anyways.
@Fraz1112 well for starters, I would at least give the nitro engines a good look through. Though it's been a while since they've last been ran, they may still very well be in good working condition. If not, then the Traxxas trade in program is hard to beat and would certainly be worth looking...