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Safe charging of lithium batteries

Remote Pilot (Part 107) practice question 22 of 22 on Operations / Emergency Procedures. ACS element UA.V.C.K2b · difficulty: standard. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONA remote pilot is recharging the lithium-based batteries of a small unmanned aircraft between flights. According to FAA guidance, what should the remote pilot follow to help ensure the batteries are charged safely?

  1. AFederal Communications Commission charger approval
  2. BThe manufacturer's battery recommendations
  3. CAn FAA waiver for battery charging procedures
Show the answer and explanation

Correct answer: B. The manufacturer's battery recommendations

  • A — incorrect The Federal Communications Commission regulates the radio frequency spectrum used for the control and video links, not the charging of batteries.
  • B — correct AC 107-2A, Appendix B, paragraph B.5 states that the remote PIC should consider following the manufacturer's recommendations, when available, to help ensure safe battery handling and usage.
  • C — incorrect No FAA waiver addresses battery charging; waivers apply to certain operating rules of part 107, and charging guidance comes from the manufacturer.

BACKGROUND

Lithium-based batteries are highly flammable and capable of ignition. A battery fire can create an in-flight emergency by causing a loss of control (LOC) of the small unmanned aircraft. FAA Advisory Circular (AC) 107-2A lists the causes of lithium battery fires as a short circuit, improper charging, heating to extreme temperatures, damage from a crash, mishandling, or a simple defect. Because improper charging is one of those listed causes, the AC directs the remote pilot in command (PIC) to consider following the manufacturer's recommendations, when available, for safe battery handling and usage.

STUDY TIP

Remember that improper charging is one of the listed causes of lithium battery fires, and that the FAA points the remote pilot to the manufacturer's instructions rather than to a regulatory approval. Distractors that invoke another agency or a waiver are a common way to test this.

KEY POINTS

  • Lithium-based batteries are highly flammable and capable of ignition; a battery fire can cause loss of control in flight.
  • Listed causes of lithium battery fires include short circuit, improper charging, extreme heat, crash damage, mishandling, and defects.
  • The remote PIC should follow the manufacturer's recommendations, when available, for safe battery handling and usage.

SOURCES

  • FAA AC 107-2A, Appendix B, paragraph B.5 "Battery Fires"
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MORE ON OPERATIONS / EMERGENCY PROCEDURES

SkyDrill is not affiliated with the FAA. This is an original practice item based on 14 CFR part 107, 14 CFR part 89, and the FAA Remote Pilot – Small UAS Study Guide (FAA-G-8082-22). Regulations and handbooks are revised; confirm details against the current edition.