We recommend the Warrior lite with the Extra Power battery. This configuration will allow you to operate during back-to-back calls or bedside (if needed) without worrying about the battery capacity (up to 6 cold-stored whole blood units with a single charge, at up to 180mL/min; 1.1kg).
If you are space or weight constrained, the Warrior lite with the lite battery can also be considered (up to 3 cold-stored whole blood units with a single charge, at up to 170mL/min; 0.8kg).