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Battery Charging
Correct battery charging ensures the maximum possible working life for the battery.There arte four major methods of charging.

  Constant Voltage Charging
  Constant Current Charging
  Two Stage Contant Voltage Charging
  Toper Current Charging
Constant Voltage Charging
This is the recommended method of charging for valve-regulated batteries. It is necessary to closely control the actual voltage to ensure that it is within the limits advised.

Float service: 2.25 – 2.30vpc at 25*c

Cycle service: 2.40 – 2.45vpc at 25*c

It is suggested that the initial current be set at 0.2C Amps. The attached graph indicates the time taken to fully recharge the battery. It should be noted that the graph illustrated is for a fully discharge battery i.e.: a battery that has reached the minimum cell voltage recommended for its discharge time. It is also seen that it is necessary to replace a greater amount of energy into the battery when it is on charge than was taken out of the battery on discharge. The actual current indicating that the battery is shown in the product summaries.
Graph A (Float)
Graph B (cycling):
Note: It is necessary to ensure that the voltage is correctly set. A voltage set to high will increase the corrosion of the positive plates and shorten battery life. A voltage set to low will lead to sulphation of the plates causing loss of capacity and ultimately shortening the life of the battery.
Constant Current Charging:
This method of charging is generally not recommended for valve regulated batteries. It is necessary to understand that if the batteries are not removed from the charger as soon as possible after reaching a state of full charge, considerable damage will occur to the batteries due to overcharging.

Tow Stage Constant Voltage Charging:

This method should not be used where the battery and lood and connected in parallel. If this method is to be used it is suggested that the Power Plus technical section is contacted.

Toper Current charging:

This method is not recommended for valve regulated batteries, if this method is to be used it is suggested that the Power Plus technical section is contacted.
Effect Of Temperature On Charging Voltage:
Within the normal operating parameters of 20*C- 30*C voltage compensation for operating temperature may not be necessary. However, to maximum the life of the battery, temperature compensation for operating temperature outside this temperature range should be considered. The attached graph shows the correct voltage for Power Plus batteries in float service at 25*C at recharge voltage of 2.4vpc and 2.45vpc. it should be noted that the voltage is decreased with a rise in temperature and increased with a fall in temperature.
Effect Of Voltage On Battery Gassing:
Although the battery is of the recombination type and the amount of gassing at normal operating voltage and temperature is reliable, however if the charging voltage is increased gassing will occur despite the recombination design of the product. Grassing does not normally occur while the battery is operating under float condition and normal constant voltage recharge of 2.25- 2.30vpc at 25*C. Very little grassing occurs when the battery is recharged under normal cycling recharges procedures. However it can be seen on the accompanying graph the higher voltages than this especially under condition of constant current charging will substantially increase the volume of gas.
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