Red Seal Electrician Practice
Safety and work practicesQuestion 785 of 1506

Where should the last connection be made when a charger is connected to a lead-acid battery?

  1. On the battery terminal itself
  2. Away from the battery, for example on a battery cable at least 30 cm from it
  3. Anywhere at all, because the connection never makes a spark
  4. Inside the battery case
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Correct answer: Away from the battery, for example on a battery cable at least 30 cm from it

A spark at the last connection could ignite hydrogen gas that collects near the battery. Make it about 30 cm away.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 11.5: Practical Considerations - Batteries

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Questions last reviewed: 18 October 2026