Tom Sizemore is back in a familiar spot this morning -- a jail cell ... after getting busted for a battery warrant.
Law enforcement sources tell us Sizemore was arrested by LAPD officers last night while they were conducting a narcotics investigation at an apartment. It was not Sizemore's apartment.
We're told Sizemore did not have any drugs on him, but police did discover he had an outstanding warrant for misdemeanor battery ... and arrested him.
He is currently in jail ... held on $26,000 bail.