Ba'asha son of Achiyah of the house of Yissachar killed King Nadav son of Yarav'am in the third year of his reign, the year 2986. And this year was counted for Nadav and for Ba'asha. And Ba'asha killed all the house of Yarav'am and reigned for 24 years until the 26th year of Asa in the fourth millennium [see Tzemach David what is written about this. But in Divrei HaYamim 2 chapter 17 it says "in the 36th year of Asa, Ba'asha came up," etc.

"and built Ramah," but he died in the 26th year of Asa, and this is reconciled in Seder Olam chapter 17, and see the Radak and Ralbag in Melachim 1 15]. And he did evil like all the sins of Yarav'am, and evil was prophesied against him by Yehu son of Chanani [(there, chapter 16)].