subject: IBM Notebook Computer Lithium-Ion Batteries [print this page] Most of the IBM laptop batteries have the following characteristics: 11,8 volts, 5200 mAH. With such a battery, you can use your device for 2 or three hours. So, if you want a good, reliable, long lasting and high quality laptop computer, an IBM one is recommended because they manage to satisfy the needs and requirements of many people throw all over the world.