For how long does the battery work?

We don’t measure the battery capacity by time, but rather by volume of warmed blood / fluids. The Warrior lite battery warms up to 3 cold-stored whole blood units or up to 2.4 liters of room temperature fluids. If greater capacity is needed, consider using the Extra Power battery (6 cold-stored whole blood units or up to 4.5 liters of room temperature fluids). Fully charged batteries assumed. The system is optimized for the high-flow and low-input-temperature range.