Features: 1. You can get long hours of battery life without having to frequently plug into recharge with the notebook battery 2. No memory effect. Chargeable even if it has not been used up yet 3. Using advanced cell technology and quality parts, the notebook laptop battery guarantees the stamina you need for long work sessions and travel 4. Manufactured to the highest quality available, notebook laptop battery with true enhanced performance 5. Notebook laptop battery is powered by high quality cells 6. The replacement laptop battery recharges while it is installed and the computer is connected to AC power Specifications: 1. Battery Type: Replacement Battery 2. Cell Type: Li-ion 3. Battery Number: 6 Cells 4. Voltage: 10.8 V 5. Capacity: 5200mAh 6. Color: Black 7. Dimensions: (9.76 x 3.74 x 1.97)" / (24.8 x 9.5 x 5)cm (L x W x H) 8. Weight: 13.61oz / 386g 9. Replace Part Number: 42T5225, 43R2499, 42T4530, 42T4531, 42T5227, 42T5262, 42T5264, 42T5229, 41U3196, 42t5263, 42t5230, 41U3197, 42T5226 Package Includes: 1 x Laptop Battery   Compatible Models: Lenovo ThinkPad R400 Series Lenovo ThinkPad R400 7443 Lenovo ThinkPad R61 Series (14.1" widescreen) Lenovo ThinkPad R61 7732, ThinkPad R61 7733, ThinkPad R61 7734, Lenovo ThinkPad R61 7735, ThinkPad R61 7736, ThinkPad R61 7737, Lenovo ThinkPad R61 7738, ThinkPad R61 7742, ThinkPad R61 7743, Lenovo ThinkPad R61 7744, ThinkPad R61 7751, ThinkPad R61 7753, Lenovo ThinkPad R61 7754, ThinkPad R61 7755 Lenovo ThinkPad R61i Series (14.1" widescreen) Lenovo ThinkPad R61i 7732, ThinkPad R61i 7742 Lenovo ThinkPad T400 Series Lenovo ThinkPad T400 2764, ThinkPad T400 7417 Lenovo ThinkPad T61 Series (14.1" widescreen) Lenovo ThinkPad T61 1959, ThinkPad T61 6377, ThinkPad T61 6378, Lenovo ThinkPad T61 6379, ThinkPad T61 6480, ThinkPad T61 6481, Lenovo ThinkPad T61 7658, ThinkPad T61 7659, ThinkPad T61 7660, Lenovo ThinkPad T61 7661, ThinkPad T61 7662, ThinkPad T61 7663, Lenovo ThinkPad T61 7664, ThinkPad T61 7665 Lenovo ThinkPad T61p Series (14.1" widescreen)