Lead-acid batteries used aboard "T-Boats" must have terminal connections that are __________.

Correct Answer: Option C — a permanent type

46 CFR 111.15-20 requires that battery terminal connections be of a permanent type to prevent accidental disconnection due to vessel vibration or motion. Clamps or spring-loaded connectors are prone to loosening, which could cause arcing, potential fire hazards, or loss of critical electrical power during vessel operations.