Gaming execs: Join 180 select leaders from King, Glu, Rovio, Unity, Facebook, and more to plan your path to global domination in 2015. GamesBeat Summit is invite-only -- apply here. Ticket prices increase on March 6 Pacific! The division is pretty clear: nickel-metal-hydride batteries are for use only in hybrid cars–at least those from Toyota, which has used more of the batteries than any other maker by far.