Section 111.15-2 - Battery construction(a) A battery cell, when inclined at 40 degrees from the vertical, must not spill electrolyte.(b) Each fully charged lead-acid battery must have a specific gravity that meets Section 11 of IEEE 45.1-2017 (incorporated by reference; see § 110.10-1 of this subchapter).(c) Batteries must not evolve hydrogen at a rate exceeding that of a similar size lead-acid battery under similar charging condition.(d) Batteries must be constructed to take into account the environmental conditions of a marine installation, including temperature, vibration, and shock.CGD 94-108, 61 FR 28277, June 4, 1996, as amended by USCG-2003-16630, 73 FR 65196 , Oct. 31, 2008