Will a mac run with out battery ? the answer is yes a mac book will run with out its battery
i took out the battery out of my mac to day cause it was dead and it was bulging
I have read in the mac book forum that if you took the battery out the CPU will work half its speed but my macbook has been running slow now for a year so i said "fuck it" and took the battery out to see if it will run. and yes it runs okay without its battery :) :D :( its running the same speed it been running al year.
You can read more on my other blog on mac book pro battery replace