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I reckon 4 hours will be too much anyway. I have plenty of experience with star trails and around 45min to 1 hour is plenty. Anything over this will just burn the brighter parts of the sky and leave you with a shot lacking in detail in some parts. Anything from 20 to 30 minutes will give you a decent result, but I guess it depends on the effect you are after, and it also depends on the sky quality. Try 4 hours if you like but I think you will experience burnout in some areas and other areas will be fine, 45mins or so, batteries shouldn't be a prob if charged fully, or buy a manual film camera (just for trails) which doesn't need batteries. If you are after the south celestial pole circular effect, then at least 1 hour will work well, for this result, alittle more than an hour will also work good, but 4 hours??, not sure the dynamic range of the camera will handle it.
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