Battery type: li-ion; voltage: 14.8v/15v; capacity: 45whcompatible models: fit for lenovo thinkpad x1 carbon gen 2 20a7, 20a8 (thinkpad new x1 carbon 20a7a04acd 14-inch) 20a8 version 2014 series; thinkpad new x1 carbon 14; fit for lenovo carbon x1 i7-4600; fit for lenovo thinkpad x1 carbon touch 20a7-002dge ultrabook, 20a8-003uge ultrabook; fit for lenovo thinkpad x1 carbon 2014