The battery is for the price simply TIPTOP! Genuine 7800mAh! Sanyo cells installed, the electronics is completely read out from the battery manager of Lenovo, to the cells also were super fresh ... in February 2014 Produced ... what I want more? Consider yet to appoint a ... by the way runs my T400 with this battery loose 7hrs with activated WLAN and half brightness (surfing or office).