  The energy extraction from a Einstein-Born-Infeld (EBI) black hole is
addressed determining the extension of the ergosphere as well as the
extractable energy using the irreducible mass concept. These results are
compared with the Reissner-Nordstrom (RN) ones; RN is the linear
electromagnetic counterpart of the BI black hole. It turns out that for a fixed
charge Q, more energy can be extracted from the RN black hole than from the EBI
one. The extreme case is investigated as well, presenting remarkable features,
for instance that more energy can be extracted from extreme EBI black holes
than from extreme RN, however, extreme EBI black holes lack of a linear
electromagnetic black hole limit.
