Which statement is true about the two metals used in batteries
1. One metal is positively charged and the other is negatively charged.
2. The metals used in batteries must be highly conductive.
3. The metals used in batteries are typically lithium and nickel.
4. The metals used in batteries undergo a chemical reaction to generate an electrical current.
The correct statement is: 4. The metals used in batteries undergo a chemical reaction to generate an electrical current.