Amnergy&reg; Battery 75+ (6 Cell) - 0a36311 for Lenovo B Series B590 ,ThinkPad E Series , E430, E430c ,E431, E435, E440, E445, E530, E530c, E531, E535, E540, E545; 6 Cells 4400mAh Amnergy Brand Battery Is Designed Using the Best Cells and Latest Safety Features to Work as a Perfect Replacment for the Original Battery. Guaranteed to Meet or Exceed Original Specifications. Premium Quality, 100% OEM Compatible. Brand New, Protective Retail Packaging, Each Product is Sealed with Anti-Static Shield Sleeve. Lithium Ion (Li- ion) Battery, Rechargable with No Memory Effect.