Starter lead accumulator units of over 30 ampere-hours capacity

1.1.1. Density of the accumulator acid depends on the climatic region.

Monthly mean air temperature, °С	Season	Density of the accumulator acid at 25°С, gram per cubic centimeter
		Of activation acid	In the charged battery
Very cold -50° through -30°	the year round	1.28	1.3
Cold -30° through -15°	the year round	1.26	1.28
Moderate -15° through -8°	the year round	1.24	1.26
Hot dry -15° through 4°	the year round	1.21	1.23
Hot humid 0° through +4°	the year round	1.21	1.23

1.1.2. Accumulator acid for activation is prepared from sulphuric acid (State Standard 667-73) and distilled water (State Standard 6709-72). Density of the acid is measured by a battery checker of State Standard 18481-81.

1.1.3. Temperature of the activation acid must not exceed 30°С. It is not recommended that the temperature of the activation acid be lower than 15°С. To achieve a corresponding density consult table 2.

1.1.4. The accumulator must be depressurized before priming. Remove sealing items (tape, flip plug ribs, etc.) depending on the type of cover. The amount of the activation acid in the battery must be brought to the 10-15 mm over the protective plate. To define the necessary amount consult table 3.

1.1.5. Measure the density of the acid not earlier than 20 min and not later than 2 hours after the activation. If the density decreases not more than by 0.03 grams per cubic centimeter, the battery must be charged.

1.1.6. In special cases, if a dry-charged battery, which was produced not longer than year before and was stored prior to priming at a temperature down to -30°С, has to be urgently put in operation, it can be activated by a solution with density of 1,27±0,01 grams per cubic centimeter and temperature of 40±20°С. If the storage period exceeds over a year, act in accordance with point 1.1.5.

Required density of the accumulator acid at 25°С, gram per cubic centimeter	Amount of water and sulphuric acid with density 1,83 gram per cubic centimeter and at temperature 25°Сthat makes one liter of accumulator acid
	Water, l.	Sulphuric acid, l.
1.21	0.85	0.21
1.23	0.83	0.23
1.24	0.82	0.24
1.26	0.8	0.26
1.28	0.78	0.29
1.3	0.76	0.31
1.4	0.65	0.42

1.2.1. Voltage supplied by the charger must not be lower than the voltage of the battery output (8.4V for the 6-Volt battery and 16.4V for the 12-Volt battery). Connect the positive terminal of the charger to the positive battery terminal and the ground terminal to the ground battery terminal accordingly.

1.2.2. Start charging unless the electrolyte temperature is over 35°С.

1.2.3. Charging rate must comply with table 3. When the output voltage of each accumulator reaches not less than 2.4 V (7.2 V for a 6-Volt bank of accumulators and 14.4 V for 12—Volt bank) decrease the charging rate by 50 per cent against the initial and then bring the batteries to total charge.

1.2.4. Keep charging until abundant gas evolution starts in all the batteries and the voltage and the density of the acid remain steady during 2 hours. The output voltage of the accumulator should be controlled by the voltage meter of State Standard 8711-93, accuracy class 0.1, with a 3 V scale a 0.02 V scale interval; for a bank of batteries use a voltage meter with a 30 V scale a 0.2 V scale interval.

1.2.5. While charging, regularly take the temperature of the accumulator acid and make sure that it does not exceed +45°C. If it does, decrease the charging rate by half or stop charging until the temperature goes down to 30–35°С.

1.2.6. At termination of charging, measure the density of the acid considering the temperature allowance in table 2 and adjust the density by adding distilled water when the density is over the appropriate level or by adding accumulator acid with density of 1.40 gram per cubic centimeter when it is below.

Upon adjustment, continue charging for 30 min more to achieve complete homogeneity of the solution, then disconnect the batteries from the charger and measure the density in all the batteries 30 min after. If the density level is too low according to point 1.1.4., add more solution of the density specified in table 1; if it is too high, remove excessive acid with a rubber bag. After charging, put the batteries in operation.

2.1.1. When the batteries are utilized in automobiles, tractors and other vehicles, their charge cycles must be supervised so as to avoid overcharge and undercharge, both of which decrease durability of the batteries.

The output voltage during the life cycle must comply with the value specified in the documentation and user’s manual of the automobile or the tractor. Maximal value must not exceed 14.6 V.

Battery Type	Nominal Voltage, V	Nominal Capacity at charging, amperes per hour		Discharging Current, А		Charging Current, А	Accumulator Acid Volume, l.
		20 hours	10hours	20hours	10hours
6ST-55	12	55	50	2.75	5	5.5	3.8
6ST-60	12	60	54	3	5.4	6	3.8
6ST-75	12	75	68	3.75	6.8	7.5	5
6ST-90	12	90	81	4.5	8.1	9	6
6ST-132	12	132	120	6.6	12	13	8
6ST-182	12	182	165	9.1	16.5	18	11.5
6ST-190	12	190	165	9.5	17	19	12
6ST-190А	12	190	170	9.5	17	19	11

2.2.1. Not less than once in two weeks make sure that the battery is firmly set in the holder and the battery cable is firmly attached to the terminals.