MacBook Pro 13" Two Thunderbolt 3 Ports (A2159) Mid 2019 Version. MacBookPro15,4 (A2159)(EMC 3301). A2289 EMC 3456. MacBook Pro 2020 M1 A2338 EMC 3578. Battery Type:Li-ion. Number of Cells:6-Cell. After you have gone through 2 to 3 cycles, you never have to condition the battery again.