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A cordless, portable blender was barely possible a few years ago. But two cordless blenders are ahead of the pack. But battery tech keeps getting better. This means the best portable blender I've tested, the Ninja Blast Max ($100), is now fully able to make a six-pack of crushed-ice margaritas at your next picnic or blend up a berry-filled protein shake at the gym without breaking much of a sweat. Meanwhile, the ingeniously designed Nutribullet Flip ($115) offers more torque than previous-generation blenders, plus enough insulation to keep ice frozen until it's time for lunch (or even dinner).