Hydrogen vs. Battery Electric Cars

Battery vs fuel cell? Why not both? I currently own (well, lease) a plug-able hybrid. I get about 45 miles on one charge of the battery (which charges empty-to-full in 10-12 hours on a normal wall plug).  When the battery charges down, it switches to the gas engine which gives another 250 miles or so.  Replace the gas engine with a fuel cell and hydrogen tank, and one could get the best of both worlds.