Alpha Technologies Nickel Cadmium Clear Case - Technical Manual - Manual (Page 11)

11 NI-CD-CLEAR-CASE
About Charging Temperatures
An electrolyte temperature of 68°F (20°C)–77°F (25°C) is ideal for charging. The temperature of the
electrolyte gradually rises as charging continues. Cells are capable of withstanding an electrolyte temperature
of up to113°F (45°C) without damage or loss of capacity.
3.2 General Charge
The charging current should equal 10% of the battery capacity. For example, the HDS 20P
has a capacity of 20AH and requires a charging current of 2 Amps for 20 hours.
Charge at 0.1 x C
10
(A) for 20 hours until the charging voltage has risen to a constant
1.65–1.80Vpc for 2.5–3 hours.
Check all the cells for the proper electrolyte density and level.
Discharge the battery at a 5 hour rate to 1.0Vpc level. (See section 7.1)
Charge at 0.1 x C
10
(A) for 20 hours until the charging voltage has risen to a constant
1.65–1.80Vpc for 2.5–3 hours.
Check all the cells for proper electrolyte density and level.
1.
2.
3.
.
5.
NOTE:
The charge state of the battery cannot be judged by measuring the specific gravity of its electrolyte.
3.0 Charging
CAUTION!
Cells can withstand temperatures up to 122°F (50°C) for short periods of time, but high
temperatures should be avoided. If the temperature exceeds 113°F (45°C), suspend charging
temporarily, and resume after the temperature has dropped sufficiently.
NOTE:
Refer to your particular charger’s manual for specific instructions regarding charger setup and operation.
3.1 Pre-Charge Preparation
Verify that the AC power source and the battery charger are in normal condition.
Measure the voltage of the entire battery as well as the voltage of each cell.
Check the specific gravity and temperature of the electrolyte for irregularities.
Connect the negative pole of the battery to the negative terminal of the charger and the
positive pole to the the positive terminal.
Verify that the vent valve on each cell is closed.
1.
2.
3.
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5.