ORIGINAL: captinjohn
It may be possible to hook up the 2 nicads in series. I think there is a 2 volt glow plug ...but not sure on that. The glow may be better...as long as the plug does not burn out!!!!
I don't think you need to glow the plug white hot. Regular glow plug on 1.2V (at 2.2A) runs fine. If voltage drops below 0.9V then it will be to cold to fire. Anythng between is OK. Higher than 1.2V will only shorthen the life of the plug.
RysiuM