MACKTECH L18L4P71 L18C4P71 Laptop Battery Compatible with Lenovo ThinkPad X1 Yoga 4th 5th Gen/X1 Carbon 7th 8th Gen Serie 02DL004 SB10K97642 02DL005 L18M4P72 SB10K97643 02DL006 SB10K97644 15.4V 51Wh 6 Cell Laptop Battery