46 C.F.R. § 112.37-1 General.
Title 46 - Shipping
Each temporary source of emergency power required by Table 112.05–5(a) must consist of a storage battery of sufficient capacity to supply the temporary emergency loads for not less than one-half hour.
Title 46: Shipping
PART 112—EMERGENCY LIGHTING AND POWER SYSTEMS
Subpart 112.37—Temporary Emergency Power Source
§ 112.37-1 General.