During preflight inspection of a small unmanned aircraft system, the remote pilot observes that one of the lithium-polymer batteries is swollen. This condition indicates a high risk of what system failure mode?

Which of the following is a recommended practice for safely charging lithium-polymer batteries used in small unmanned aircraft systems (sUAS)?

Lithium batteries in small unmanned aircraft systems can enter a state of thermal runaway due to factors such as physical damage, overcharging, or manufacturing defects. What is the primary systems-level hazard that results from thermal runaway?

Which of the following is a recommended best practice for safely charging lithium-polymer batteries used in small unmanned aircraft systems?

For safe transportation of lithium batteries used in small unmanned aircraft systems, what must the remote pilot in command ensure?

While operating a small unmanned aircraft 4 statute miles from the nearest suitable landing site, the remote pilot observes 15% battery capacity remaining. The aircraft cruises at 35 miles per hour (mph) and consumes battery at an average rate of 3% per minute. Approximately how much flight time remains before depletion, and what is the MOST APPROPRIATE immediate action per emergency procedures?