good to see what you ended up with after all that stuffing around with cold batteries eh! i think you could make it better if you removed the one odd exposure at the start (or is it the end?). the regular sequenced images would then look alright..
even when i use 'continuous shooting' mode on the camera so that it is rolling from one frame to the next as fast as it can, i still get (small) gaps in my widefield star trails (which surprised me). i used to try and get a star trail and a timelapse out of the one sequence of images, but have given up and now i go either for either the timelapse (short exposures, high iso) or for a star trail (single long exposure, low iso). having the aperture wide open and high iso for the timelapse also burns out the stars so there's very little colour left. i also still use film for star trails too - no hot pixels and nice natural colour balance in long exposures!
but just think.. you could have got a nice deep widefield shot of the milky way too, if only you had an EQ6
Phil