Lithium-based batteries used in small UAS are highly flammable. According to AC 107-2A, a lithium battery fire can be caused by which of the following?
Why: AC 107-2A Appendix B.5 states that lithium battery fires can be caused when a battery short-circuits, is improperly charged, is heated to extreme temperatures, is damaged in a crash, is mishandled, or is simply defective.
Describes normal, expected battery discharge, which AC 107-2A does not list as a fire cause.
Describes a safe storage practice, not a hazard; AC 107-2A lists extreme heat, damage, and mishandling as hazards, not ordinary room-temperature storage.