Armor (light, medium or heavy), common
The charged armor is one of the lessor forms of magic armor, but it is being cheaper to the craft and requiring less talent. Also they are usually created intentionally by the hedge wizards and also some other lesser spellcasters, or else they could the result of the failed attempt at the crafting a normal suit of the magic armor.
All of the charged armors has 1d4 + 1 charges. The wielder could spend the bonus action for expending the charge. This shall activates the charged armor for a minute, at the time which it is treated like the suit of magic item with a +1 bonus to AC. Whenever all of the charges are expended, it would become the normal suit of nonmagical armor.