R.I. Gen. Laws § 23-60.1-3: Reduction of mercury content in alkaline batteries.

No alkaline-manganese battery manufactured on or after January 1, 1992, shall be distributed, offered for sale, or sold, if it contains more than 0.025 percent (.025%) mercury by weight; provided, however, that for any alkaline-manganese battery resembling a button or coin in size and shape, the limitation shall be twenty-five (25) milligrams of mercury.