### Question
What is the definition of battery?


### Answer
The definition of **battery** is as follows in *42 U.S.C. § 17011*:

> an electrochemical energy storage system powered directly by electrical current

#### Citation:
  - *42 U.S.C. § 17011*
  - Heading: **CHAPTER 152-ENERGY INDEPENDENCE AND SECURITY > SUBCHAPTER I-IMPROVED VEHICLE TECHNOLOGY**

