Abstract: The invention concerns a mixer tap battery cartridge in which are fitted an inlet washer and control washer made from ceramic material, the control washer being provided with a hot water backflow chamber and a cold water backflow chamber, while the inlet washer has a hot water rising channel, hot water backflow channel, cold water rising channel, and cold water backflow channel. A cold water inlet channel is connected to the cold water rising channel, a cold water outlet channel is connected to the cold water backflow channel, a hot water inlet channel is connected to the hot water rising channel, and a hot water outlet channel is connected to the hot water backflow channel. The other end of the hot water outlet channel and of the cold water outlet channel are situated next to a control plunger which is connected, preferably mechanically, to a thermal expansion insert.