Abstract: A portable thawing unit for heating animal fluids and cells (stored in straws) includes a main casing for holding water therein. A lower body secured to the main casing includes a battery pack and plug for recharging the battery pack. An upper body secured to the main casing allows at least one straw to enter the main casing for immersion in the heated water. A heating element and thermistor heat the water in the main casing to a desired temperature. A straw rack unit having at least one straw shaft holds straws and allows them to be lowered and raised. A motor powered by the batter pack runs a propeller that helps mix the water. The thawing unit does not allow straws in the main casing to contact each other, allowing, for example, 95 to 98.6 degrees Fahrenheit water to better contact the straws and heat them more efficiently.