1)
Here it says that all other matters of Aviyam are written in Divrei ha'Yamim. In Divrei ha'Yamim II, 13:22 it says that they are written "b'Midrash ha'Navi Ido"!
1.
Malbim (Divrei ha'Yamim II, 13:22): Here it refers to his wars. Divrei ha'Yamim discusses his ways and other matters.