Here it says that Asa and Basha had war all their days. Basha became king in Asa's third year (verse 33), and Divrei ha'Yamim II, 13:23 says that Asa had 10 years of serenity!
'Rashi' (Divrei ha'Yamim II, 14:6): Asa had three years of serenity before Basha became king. They had Shalom for seven years, and war for the rest of their years.
Malbim: There was not war until his 15th 1 year, but there were minor scuffles. After 15 years was a big war.
Malbim (Divrei ha'Yamim II, 15:10): Divrei ha'Yamim II, 15:10 says that they gathered in Asa's 15th year; it was after the war with Zerach ha'Kushi, for they offered the spoils that they took (15:11)! Also refer to 15:33:2:2*.
Here it says that Asa and Basha had war all their days. Divrei ha'Yamim II, 15:19 says that Asa did not have war until his 35th year. Basha died in Asa's 26th year, for then his son Elah became king (16:8)!
'Rashi' (Divrei ha'Yamim II, 14:6): Asa did not have war with Melech Kush until his 35th year.
