Total Micro - Notebook battery (equivalent to: IBM 51J0500) - lithium ion - 9-cell - 8400 mAh - for Lenovo Edge 15; ThinkPad Edge 14in; 15in; E420; E425; E520; E525; ThinkPad SL410; SL510

Superior cells for superior performance. Inside every notebook battery is a grouping of "energy cells" containing chemical mixtures that provide an electrical current to power the notebook computer. This is the primary component of any battery and the quality and performance of these cells determines not only how long a battery will operate before needing to be recharged, but also the number of charge/discharge cycles the unit will sustain. High quality cells typically will provide several years of charge/discharge performance and several hours of computing time per full charge.