The IBM Thinkpad T40 T41 T41P T42 laptop battery has a black shell that is a qualified 6-cell replacement battery. We have witnessed the development of technologies that have made these lithium-ion batteries for IBM Thinkpad T40 T41 T41P T42 more powerful in cells, anode, cathode, electrolyte, control circuits and so on. The power output for this battery is 10.8V and 4800mAh, which can charge and discharge more smoothly and securely.
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