L20C4P71 SB10T83217 5B10W13974. L20D4P71 SB10T83218 5B10W13975. L20M4P71 SB10T83216 5B10W13973. Capacity: 3695mAh / 57Wh. Lenovo ThinkPad X1 Carbon 9th Gen (X1 Carbon 2021) Series. Lenovo ThinkPad X1 Carbon 10th Gen (X1 Carbon 2022) Series.
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