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Specifications: Voltage: 15.44V. Capacity: 57Wh/3695mAh. Battery Type: Li-Polymer. Condition: Brand new, constructed from premium materials, featuring advanced circuit boards and a smart chip. Replaces Part Numbers: L20C4P71, L20M4P71, SB10T83217, SB10T83216, 5B10W13973, 5B10W13974, L20D4P71, SB10T83218, 5B10W13975, L20L4P71, SB10T83215, 5B10W13972. Compatible Models: For Lenovo ThinkPad X1 Carbon 9th Gen 20XW 20XX series. For Lenovo ThinkPad X1 Carbon 10th Gen (Type 21CB, 21CC) series. For Lenovo ThinkPad X1 Yoga 7th Gen (Type 21CD, 21CE) series. For Lenovo ThinkPad X1 Yoga 6th Gen (Type 20XY, 20Y0) series. It is rated for around 500 recharge cycles