Can used lithium batteries be mailed?

The correct choice is that only new lithium batteries can be mailed. This is because used lithium batteries are often classified as hazardous materials due to their potential to cause fires or leaks. Mailing rules and regulations are set by postal services and regulatory agencies to ensure safety and compliance. New lithium batteries typically meet safety standards and are packaged in a way that minimizes risks during transport.

Options that suggest used lithium batteries can be mailed without restrictions overlook the potential dangers these batteries pose. Mailing them under special conditions would imply that there might be some allowances, but in most cases, it is best practice to avoid mailing used batteries altogether unless explicitly outlined by specific regulations. Bulk shipments could also imply special handling requirements, which do not generally apply to used batteries. Thus, the safest and most compliant action is to restrict mailing to new lithium batteries only.