Which of the following statements is true about an actively swelling embedded battery?

Question

Options

• AActively swelling batteries are not considered a safety concern.
• BActively swelling batteries are likely caused by large amounts of liquid inside the batteries.
• CActively swelling batteries are unlikely to lead to thermal runaway.
• DActively swelling batteries are more likely to rupture and release gasses.

• B
  4% (1)
• C
  4% (1)
• D
  91% (21)

Explanation

An actively swelling battery is undergoing internal pressure buildup - typically from gas produced by chemical reactions (like electrolyte decomposition) - which makes rupture and hazardous gas release a genuine and immediate risk, making D correct.

Why the distractors are wrong:

• A is false: a swelling battery is a serious safety hazard and should be treated as such immediately.
• B is false: swelling is caused by gas buildup from chemical reactions, not liquid accumulation inside the cell.
• C is false: swelling is actually a warning sign that thermal runaway may be imminent - the two are closely linked.

Memory tip: Think of a swelling battery like a balloon being over-inflated - the more pressure builds, the more likely it pops. Gas = pressure = rupture risk. "Swell → Gas → Boom" keeps the chain of events straight for the exam.

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