After picking up a Lenovo ThinkPad way back in 2006, you have loved your speedy little device to pieces. If that X61 battery is starting to go, you may want to replace it with a new one to continue getting a huge length of time between charges. After time, batteries start to deteriorate in quality, meaning that the charge life becomes increasingly shorter as the years pass. If your ThinkPad is not quite holding a charge like it used to, pick up a new 8-cell Lenovo X61 battery. This lithium-ion battery kicks out 14.4 volts and has a capacity of 4,800 mAh. The ThinkPad X61 Battery is compatible with the ThinkPad X61, which comes with a 1.6 GHz processor, 512 MB of RAM, 80 GB of hard drive space, and a screen size of 12.1 inches. While you would have a difficult time finding the X61 battery in stores, you can find one on eBay, where many sellers are offering convenient shipping options to suit your needs. Do not throw out your precious ThinkPad because the battery is wearing down; simply replace it and keep enjoying your ultra-compact device.