How to Replace the Internal Laptop Batteries on a IBM ThinkPad Laptop

The IBM Thinkpad laptop, like all computers, contains an internal laptop batteries known as a CMOS battery. Like any other battery, the CMOS battery can drain or lose its charge over time. Replacing the internal battery of an IBM Thinkpad requires you to disassemble the laptop and access the internal components, observing electrical safety precautions. Gently pry the CMOS internal battery from its housing and disconnect it from the motherboard, providing support to the plastic part of the connectors as you pry.