Effect of host crystallinity on lithium extraction/insertion of LiMn2O4 was studied. LiMn2O4 powders with different crystallinity were prepared via lithium-manganese-tartrates by heat treatment at various temperatures above 300 degrees C. First charge-discharge capacity around 4 V depended on lattice parameter a(0) and lattice strain epsilon. On the other hand, the first discharge capacity around 3 V was found to be independent of these parameters.