GS 35:2007

                                                                                      METHODS OF TEST FOR  

                                                                LEAD-ACID STARTER BATTERIES USED FOR  

                                                                          MOTOR VEHICLES AND INTERNAL  

                                                                                 COMBUSTION ENGINES

                                                                机动车辆和内燃机用铅酸起动蓄电池的试验方法

1- SCOPE AND FIELD OF APPLICATION   

This standard is concerned with the methods of test for 6V and 12V lead-acid  batteries, used primarily as a power source for starting, lighting auxiliary  equipment and ignition current of internal combustion engine used in vehicles.   It covers the methods of tests for the batteries covered in the standard mentioned  in Sub-clause 2.1.  

2- COMPLEMENTARY REFERENCES  

2.1 GSO 34/2007 “Lead-Acid Starter Batteries Used for Motor Vehicles and Internal  Combustion Engines”.  

2.2 GSO 886 /1997 “Water for Lead-Acid Batteries”.  

2.3 GSO 479/1994 “Sulphuric Acid”.  

3- MEASURING INSTRUMENTS  

3.1 Electrical measuring instruments   The range of instruments used shall be appropriate for the magnitude of the  voltage or current to be measured.   For analogous instruments the readings shall be taken in the top third of the scale.  

--3.1.1 Voltage measurements   The instruments used for measuring voltages shall be of high impedance type and  accurate to the second decimal or better. The resistance of the voltmeters used  shall be at least 300 Ω/V or a digital voltmeter with an accuracy of 0.5%.  

--3.1.2 Current measurements   The instruments used for measuring current shall be of accuracy class 1 or better.  

3.2 Temperature measurement   The thermometers used for measuring temperatures shall have an appropriate  range, and the value of each scale division shall not be greater than 0.5 K. The  accuracy of the calibration of the instruments shall be not less than 0.5 K.  

3.3 Specific gravity measurement   The specific gravity of the electrolyte shall be measured with hydrometers  furnished with a graduated scale, the value of each division of which is equal at  most to 0.005. The accuracy of calibration of these instruments shall be to 0.005  or better.  

3.4 Time measurement  The instruments used for measuring time shall be graduated in hours, minutes,seconds or in hours and centihours ch ( = 1 /100  h ). They shall have an accuracy of  at least ± 1%.  

3.5 Dimensions measurement   The instruments used for measuring dimensions shall be vernier calliper,  measuring tape and the like. They shall have an appropriate range and accuracy  for the values to be measured.  

4- GENERAL TEST CONDITIONS  

4.1 Condition of battery samples   All tests shall be carried out on new battery samples. Samples shall be considered  as new not later than:  - 30 days after shipment date of the manufacturer in case of filled batteries;  - 60 days after shipment date of the manufacturer in case of dry-charged  batteries.  

4.2 Preparation of batteries prior to test - definition of a fully-charged battery   All tests, except those in Clauses 10 and 16, shall commence with fully charged  batteries.   Batteries shall be considered as fully-charged if they have undergone one of the  two charging procedures of Sub-clauses 4.2.1 or 4.2.2 carried out at (27 ± 5)°C.  

--4.2.1 Charging at constant current   The battery is charged with 2 I20 (where I20= C20 /20) until a voltage of 2.4 V/cell  is achieved. Then the charging is carried out with 2 I20 for additional 5 h.   After a rapid discharge capacity test at low temperature, the same charge is  applied, however the residual charging time after reading 2.4 V/cell will be only 3  h with 2 I20.  

--4.2.2 Charging at constant voltage   The battery is charged at 2.667 V/cell ± 0.1 V for a period of 22 to 30 h, the  current intensity being limited to 5 I20 or as specified by the manufacturer.   A reduction of total charging time to 16 h is admissible after a rapid discharge  capacity test at low temperature.  

NOTE: If neither complete knowledge of the battery construction nor a specification from the  manufacturer is available, then charge according to this Sub-clause (4.2.2).  

4.3 Activation of dry-charged (charge-conserved) batteries   Dry-charged batteries shall be filled with the appropriate electrolyte (1.28 ± 0.01) to the maximum level indicated by internal or external marks or according  to the manufacturer’s instructions.  

4.4 Fully charged battery  

--4.4.1 The batteries subjected to test shall be filled and charged in accordance with the  manufacturer’s instructions. The level and specific gravity of the electrolyte in  each cell shall be checked and adjusted after the charge on standard batteries only.

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