This replacement laptop battery from eReplacements is 100% compatible with your 57y4186 compatible battery and is in color and is rated at 7800mAh and 11.1 Volts. eReplacements laptop batteries all come with a 1 year warranty and will meet or exceed the original 57y4186 compatible battery laptop battery specifications because they are manufactured for high performance in our ISO 9000 factories using the best quality cells and most up to date safety and engineering control standards. Replaces Lenovo battery models 57Y4186, 57Y4545-ER, 57Y4545-TM