The Total Micro 08K8197 - TM Lithium Ion Notebook Battery is a high - performance battery specifically engineered for IBM ThinkPad T40 series laptops. With a voltage of 10.8V DC and a robust capacity of 7200 mAh, this rechargeable battery ensures extended usage and dependable performance. It is compatible with various models including T40, T40p, T41, T42, T42p, R50, R50e, R50p, and R51, making it a versatile choice for users needing a reliable power source. The battery charges quickly, allowing you to save time and stay productive without frequent trips to the store for replacements.