This 6 - Cell 4400mAh Li - Ion Laptop Battery is designed specifically for IBM ThinkPad models T20, T21, T22, and T23. With a capacity of 4400 mAh and a voltage of 10.8 V DC, this rechargeable battery ensures reliable power for your notebook, allowing you to work efficiently without interruptions. Its proprietary battery size guarantees compatibility and maximum productivity, while the environmentally friendly design makes it a sustainable choice compared to disposable batteries. Enjoy longer usage times and quicker charging with this dependable battery solution.