An ink cartridge for use in a mobile device, the ink cartridge including: at least one ink reservoir for holding ink; at least one baffle dividing the at least one ink reservoir into a plurality of sections, each of the sections in each ink reservoir being in fluid communication with each of the other sections in that ink reservoir via an aperture; and at least one porous insert in each of the at least one reservoirs, such that substantially all of each ink reservoir is filled with the at least one porous insert.