A hydrogen storage alloy is provided which, when used in a battery, has
high drain (power) performance and charge acceptance that are excellent,
and in addition, cracks are few, and cycle life performance are
excellent, to be used in large batteries, in particular for electric
vehicles, hybrid electric vehicles, high-power use, and the like. The
hydrogen storage alloy is a hydrogen storage alloy having phase
conversion accompanying the variation of hydrogen storage capacity (H/M)
and is in a single phase or in a state close to a single phase when the
above-mentioned hydrogen storage capacity (H/M) is in a range of 0.3 to
0.7 or 0.4 to 0.6.