MicroBattery 29.97Wh Lenovo Laptop Battery Li-Pol 7.4V 4050mAh, MBXLE-BA0090 (Li-Pol 7.4V 4050mAh Black, S41, S41-35, S41-70, S41-70AM, S41-70-ISE, S41-75, Yoga 500, Yoga 500-14I)