When did Baasha die?
In the 26th year of King Asa's reign.
So Baasha slept with his fathers, and was buried in Tirzah: and Elah his son reigned in his stead.... In the twenty and sixth year of Asa king of Judah began Elah the son of Baasha to reign over Israel in Tirzah, two years. 1 Kings 16:6-8
Sometime after the 36th year of King Asa's reign.
In the six and thirtieth year of the reign of Asa Baasha king of Israel came up against Judah, and built Ramah. 2 Chronicles 16:1
(If these two verses are true, then Baasha fought with Judah ten years after his death!)