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I normally use my 755Cx in its docking station as a desktop. When I'm using it as a desktop I remove the battery in an effort to prolong the life of the battery. I recently installed the battery only to find the computer not recognizing the battery. The fuel gauge shows a dotted line for the battery. Pressing the discharge button displays a message the battery is not installed. The charge and battery condition LED's flash periodically. I had this same problem last summer and contacted IBM service who told me to replace the battery. The replacement battery fixed the problem. However, this time when I installed a brand new battery the TP still wont recognize that a battery is installed. Is it possible both my batteries are bad? If the batteries get "completely" drained will the TP not recognize them? Is there a way to charge the battery out of the TP? What is the shelf life of the Li-Ion battery? How do I get my TP to work off the battery again?