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Batteries are the powerhouse of any notebook. The reservoir of energy that gives you the independence to work mains-free. And now, when you need even more power, all you need to do is to slip in the additional battery. With dead batteries, your notebook is little more than a technologically advanced paperweight. If your computing plans include any significant time away from a power outlet then extra batteries are a must-have accessory.This battery is designed for HP OmniBook 4100 Series.