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Keep a spare ThinkPad 230W AC Adapter on hand to ensure your ThinkPad has a consistent flow of power. Keep one adapter in the office, one at home and another in your carrying case for immediate, convenient access to power. This ThinkPad AC adapter is perfect for use as a spare or replacement adapter for compatible laptops. It is compatible with all Lenovo laptops with the rectangular “slim-tip” common power plug. It is not compatible with legacy notebook systems with the round, barrel-type power plug. ThinkPad AC adapters are compact so you can easily keep a spare tucked into your carry case at all times. This 230w adapter will perform to the exact same standard as the one that originally came with your laptop. It is highly energy efficient and is backed by an official Lenovo 1-year warranty.