Section 8 in The Merchant shipping (Radio Direction Finders) Rules, 1968.
8. Charging of batteries.
(1)If Batteries are provided as a source of electrical energy for the radio direction-finder, means shall be provided on every ship for the charging of such batteries from the ship's main source of electrical energy. The master of the ship shall cause to such batteries to be tested once a day by Voltmeter and once a month by Hydrometer, and shall cause any battery which is found not to be fully charged to be brought up to that condition as soon as possible.(2)The master of every ship shall maintain or cause to be maintained a separate record and whenever any batteries providing source of electrical energy for radio direction-finder are charged, or r when such batteries are tested daily by a Voltmeter, or when such batteries are tested monthly by a Hydrometer, as required by sub rule (1), he shall make or cause to be made appropriate entries in the said records in regard to such charging or testing of batteries. The said record shall be placed on board together with records of calibration maintained under rule 13 and shall be made available to the radio inspector for inspection at any reasonable time.
