Which of the following is a safety concern when selecting Li battery?

Which of the following is a safety concern when selecting Li battery?

• A. A dent on the casing.
• B. A bulge on one side of the case.
• C. A dent on the label.
• D. A swollen outer casing with bulge.

Answer: (B)

Swelling or deformation signals internal damage and gas buildup in Li batteries. A bulge on one side of the case shows localized swelling of the cell, meaning gases are accumulating inside and the internal structure is compromised. This weakens the cell housing and raises the risk of puncture, short circuits, or violent venting and fire, especially during charging or if the battery heats up. That’s why it’s a clear safety red flag when selecting or inspecting a Li battery. Other signs, like a dent on the casing, might come from impact and don’t necessarily reflect the cell’s internal condition; a dent on the label is irrelevant to the cell’s safety, and a swollen outer casing with bulge is also hazardous, but the bulge on one side directly points to internal swelling. If you see this, do not use the battery; isolate it in a nonflammable container and arrange for proper disposal.

Swelling or deformation signals internal damage and gas buildup in Li batteries. A bulge on one side of the case shows localized swelling of the cell, meaning gases are accumulating inside and the internal structure is compromised. This weakens the cell housing and raises the risk of puncture, short circuits, or violent venting and fire, especially during charging or if the battery heats up. That’s why it’s a clear safety red flag when selecting or inspecting a Li battery. Other signs, like a dent on the casing, might come from impact and don’t necessarily reflect the cell’s internal condition; a dent on the label is irrelevant to the cell’s safety, and a swollen outer casing with bulge is also hazardous, but the bulge on one side directly points to internal swelling. If you see this, do not use the battery; isolate it in a nonflammable container and arrange for proper disposal.