Abstract: The present utility model provides a battery capacity chromogenic device that directly indicates the residual capacity of the lead acid battery. Said device comprises: a plurality of integrally formed indicating bars, fixing sleeves each provided on the upper end of respective indicating bars, supporting brackets each provided on the lower end of respective indicating bars, and color balls corresponding to the indicating bars in number, said supporting brackets are provided thereon with color ball passages corresponding to the indicating bars in number, said respective color ball passages are slantly disposed such that the vertical projections of the upper portions thereof and the vertical projections of the lower portions thereof are mutally staggered in the horizontal direction, and said respective color balls are increased in specific gravity successively and are respectively disposed in a certain order within said respective color ball passages.