Yes, lithium ones, those were the ones that kept catching fire then the 787 was just out. I guess they're just for the time until the RAT kicks in. Or to augme

Yes, lithium ones, those were the ones that kept catching fire then the 787 was just out. I guess they're just for the time until the RAT kicks in. Or to augment it. Ps there's also the APU, a small turbine in the tail for generating electricity.