Thank you so much for these very positive replies.
I guess Nick Agnani was trying to make a point, damn good job he didn't decide to fly on to Paris or the likes. When on No 1 ANS at Stradishall the Varsities we used to ground test after servicing were started by trolley acc's but I'm just wondering that in an emergency situation (or in Agnani's case) starting port engine on aircrafts battery system would have been possible?