This Lenovo X1 carbon battery is compatible with the first generation of Lenovo ThinkPad X1 3444 Carbon laptops. Compatible with the following Lenovo X1 Carbon models: 3443 Series 3444 Series 3444-25U 3444-28U 3444-2DU 3444-2GU 3444-2HU 3444-2KU 3444-4ZU 3444-52U 3444-53U 3444-54U 3444-55U 3444-56U 3444-59U 3444-5AU 3444-AWU 3444-AZU 3444-B7U 3444-B8U 3444-B9U 3444-BAU 3444-BBU 3444-BCU 3444-BDU 3444-BEU 3444-BFU 3444-CUU 3444-CWU 3444-CXU 3444-CYU 3444-F7U 3444-F8U 3444-F9U 3444-FAU 3444-FBU 3444-FCU 3444-FDU 3444-FEU 3444-FFU 3444-FGU 3446 Series 3448 Series 3448 Series 3448-22U 3448-23U 3448-24U 3448-25U 3448-2MU 3448-34U 3448-35U 3448-39U 3448-3AU 3448-58U 3448-59U 3448-5AU 3448-5BU 3448-5CU 3448-5DU 3448-7FU 3448-7MU 3448-7NU 3448-7PU 3448-8RU 3448-8SU 3448-94U 3448-95U 3448-AVU 3448-AWU 3448-AXU 3448-AYU 3448-AZU 3448-B2U 3448-B3U 3448-B4U 3448-B6U 3448-B8U 3448-BBU 3460 Series 3460 Series 3460-22U 3460-23U 3460-24U 3460-25U 3460-34U 3460-35U 3460-36U 3460-37U 3460-58U 3460-59U 3460-5AU 3460-5BU 3460-5CU 3460-5DU 3460-9RU 3460-9SU 3460-9TU 3460-9UU 3460-9VU 3460-9WU 3460-ALU 3460-AMU 3460-AVU 3460-AWU 3460-AXU 3460-AYU 3460-AZU 3460-B2U 3460-BDU 3460-BEU 3460-BFU 3460-BGU 3460-BNU 3460-BPU 3460-BQU 3460-BRU 3462 Series 3463 Series 45N1071 What's in the box 1 X Battery