the total charge a battery can supply is rated in ma⋅h, the product of the current (in ma) and the time (in h) that the battery can provide this current. a battery rated at 1000 ma⋅hr can supply a current of 1000 ma for 1.0 h, 500 ma current for 2.0 h, and so on. a typical aa rechargeable battery has a voltage of 1.2 v and a rating of 1800 ma⋅h.