Futurebatt&reg; Laptop Battery for Lenovo Thinkpad R400 7443 T400 2764 7417, ThinkPad R61 R61i 10.8V 5200mAh Voltage: 10.8V Li-ion Laptop Batteries. Capacity: 5200mAh, Cell count: 6. NOTE: The battery is for ThinkPad Widescreen 14.1" R61i T61p ThinkPad Widescreen 14.1" R61 R61i T61. NOT COMPATIBLE WITH narrow screen IBM ThinkPad T61 R61 series. Notebook/Laptop Battery for IBM/Lenovo 42T4533 42T4652 43R2499 ThinkPad R400 T400 ThinkPad Widescreen R61i T61p ThinkPad Widescreen 14.1" R61 R61i T61 IBM-Lenovo 33++ 42T4531 Fit for Lenovo Thinkpad R400, ThinkPad R61, ThinkPad R61i, ThinkPad T400, ThinkPad T61. This Product has 12 Months Replacement Warranty! With Hassle-free Customer Service