42 U.S. Code § 14322 - Rechargeable consumer products and labeling
For a period of 2 years after May 13, 1996, regulated batteries, rechargeable consumer products containing regulated batteries, and rechargeable consumer product packages that are labeled in substantial compliance with subsection (b) of this section shall be deemed to comply with the labeling requirements of subsection (b) of this section.
Failure of the Administrator to object to an application under subparagraph (A) on the ground that a different label does not meet either of the conditions described in subparagraph (A)(i) or (ii) within 120 days after the date on which the application is made shall constitute certification for the purposes of this chapter.
After the effective dates of a requirement set forth in subsection (a), (b), or (c) of this section or a regulation promulgated by the Administrator under subsection (d) of this section, no Federal agency, State, or political subdivision of a State may enforce any easy removability or environmental labeling requirement for a rechargeable battery or rechargeable consumer product that is not identical to the requirement or regulation.
A person granted an exemption under paragraph (2) may apply for a renewal of the exemption in accordance with the requirements and procedures described in paragraphs (1) and (2). The Administrator may grant a renewal of such an exemption for a period of not more than 2 years after the date of the granting of the renewal.