L20C4P71 battery, for Lenovo ThinkPad X1 Yoga 6th Gen (20XY / 20Y0) series, for Lenovo ThinkPad X1 Yoga 7th Gen (21CD / 21CE) series, for Lenovo ThinkPad X1 Yoga 8th Gen (21HQ / 21HR) series, for Lenovo ThinkPad X1 Carbon 9th Gen (20XW / 20XX) series, for Lenovo ThinkPad X1 Carbon 10th Gen (21CB / 21CC) series, for Lenovo ThinkPad X1 Carbon 11th Gen (21HM / 21HN) series, for Lenovo ThinkPad X1 Yoga 2021 2022 series, for Lenovo ThinkPad X1 Carbon 2021 2022 series.