One of the common problems with laptops is the deteriorating performance of its battery. Laptop batteries are made up of Lithium Ion (Li-ion). I have a laptop that is more than a year old. Last week, its battery went totally dead. I'm still looking for a replacement. I'm very careful in finding one because most cheap alternatives are poor in performance (with only 45 mins up time compared to the original 3-4 hours). Some are overly priced. I now have a prospect seller and will be purchasing after this post. Well, to continue, out of my curiosity, I opened the battery. The laptop is a Lenovo 3000 G410. Before my exploration, I took the specifications of the battery. It turned out that it's manufactured by SANYO. Here are the specifications: Battery name: PABAS024 Unique ID: 3658QSANYO PABAS024 Chemistry: LION I really don't have any knowledge about the hardware. All I know is that it can be charged and discharged. Despite my limited knowledge, I still opened it up ...