The KA-50 can start on batterys only.
There are many ways to start the KA-50. But there are a few basic switches that need to be fliped in order. batterys / ground power, fuel pumps, fuel shut off's, Start APU, start right engin right cut-off same for left, EEG's on, bring to auto throttle, batterys on if not allready, left and right Gen's. And now you can turn on what ever els is needed, but not required to take off.