VISION CL series of VRLA batteries are recognized as the most reliable and high quality battery system in the industry. VISION CL series batteries designed with advanced AGM(Absorbent Glass Mat) technology, Long service life designed with 20 years, the batteries comply to the most popular international standards, such as IEC896-2, BS6290-4, Eurobat Guide.
Product Standards
You can expect our batteries meet with the standards DIN, IEC & BS6290-4. We have obtained ISO9001 & ISO14001 certification. We have obtained UL approval (MH25860) for all types of batteries. We have obtained CE approval for all types of batteries. All these render our batteries to be compatible with requirements of world-level equipments.
Main Application
Communication equipment, Telecommunication control equipment;Emergency lighting systems; Electric power systems;Power station; Nuclear power station; Solar powered and wind powered systems; Load leveling and storage equipment; Marine equipment; Power generation plants; Alarm systems; Uninterruptible power supplies and stand-by power for computers; Medical equipment; Fire and security systems; Control equipment; Stand-by electric power.
Stable Quality & High Reliability
VISION battery is well-known for its stable and reliable performance.VISION batteries are easy to maintain; thus,permitting a safe and proper operation of the equipment that the battery powers. The battery can withstand overcharge, over discharge,vibration, and shock.It is also capable of extended storage.
Sealed Construction
VISION's unique construction and sealing technique guarantees that no electrolyte leakage can occur from the terminals or case of any VISION battery. Thisfeature insures safe and efficient operation of VISION batteries in any position. VISION batteries are classified as "Non-Spillable" and will meet all requirements of the International Air Transportation Association. (IATA Dangerous Goods Regulation,41# Edition,Section 4.5A,Special Provision:A67)
Long Service Life, Float or Cyclic
The VISION VRLA battery has a long life in float or cyclic service. The expected life of float service is 20 yeas @ 25OC, and life of cyclic service as shown on Figure 4.
Maintenance-Free Operation
During the expected float service life of VISION batteries, there is no need to check the specific gravity of the electrolyte, or add water.
Low Pressure Venting System
VISION batteries are equipped with a safe low pressure venting system,which operates from 1 psi to 6 psi.The venting system is designed to release excess gas in the event that the gas pressure rises to a level above the normal rate.Afterwards,the venting system automatically re-seals itself when the gas pressure level returns its normal rate.This feature prevents excessive build up of gas in the batteries. This low pressure venting system, coupled with the extraordinarily high recombination efficiency, make VISION batteries the safest VRLA batteries available.
Heavy Duty Grids
The heavy-duty lead calcium-alloy grids in VISION batteries provide an extra margin of performance and service life in both float and cyclic applications, even in conditions of deep discharge.
Low Self Discharge
Because of the use of Lead Calcium grids alloy, VISION VRLA battery can be stored for long periods of time without recharge.
Construction
Positive plates
Positive plates are made from a Lead-Calcium system.
Negative Plates
Negative plates are made from a Lead-Calcium system.
Separators
The glass fiber separators in VISION VRLA batteries have high absorbability to acid. The high porosity of the separators retains adequate electrolyte for the reaction of active materials in the plates.
Safety Vents
The venting system, which operates at 1 psi to 6 psi (0.07-0.43kg/cm2)is designed to release excess gas and keep the internal pressure within the optimum range of safety. At the same time, it protects the negative plates from contamination from oxygen in the air. Vents are 100% visually inspected during battery production.
Terminals
Depending on the battery model, the terminals may be F10......Excellent terminal sealing construction has been achieved by using long mechanical sealing paths and A selection of small shrinkage ratios for the sealing materials.
Case Materials
Standard case and cover are manufactured from ABS resin.
Battery Charging
Correct battery charging ensures the maximum possible working life for the battery. There are four major methods of charging:
Constant Voltage Charging.
Constant Current Charging.
Two Stage Constant Voltage Charging.
Taper Current Charging.
Constant Voltage Charging
This is the recommended method of charging for VRLA batteries. It is necessary to closely control the actual voltage to ensure that it is within the limits advised.
Float Service: 2.25-2.30 Vpc at 25oC .
Cycle Service: 2.40-2.45 Vpc at 25oC .
SZCPT suggest that the initial current be set within 0.4C Amps. The attached Figure 6 indicates the time taken to fully recharge the battery. It should be noted that the graph illustrated is for a fully discharged battery, i.e; a battery that has reached the minimum cell voltage recommended for its discharge time. As shown on the graph,it is necessary to charge a greater amount of energy into the battery than was taken out of the battery on discharge. The actual current indicating that the battery is fully charged is approx 5mA/Ah under charging voltage is 2.30 Vpc.
Constant Current Charging
This method of charging is generally not recommended for VRLA batteries. It is necessary to understand that if the batteries are not removed from the charger after reaching a state of full charge, considerable damage will occur to the batteries due to overcharging.
Two Stage Constant Voltage Charging
This method should not be used when the battery and load are connected in parallel. If this method is to be used, it is suggested that the VISION technical department is contacted.
Taper Current Charging
This method is not recommended for VRLA batteries. However, if this method is to be used, it is suggested that the VISION technical department is contacted.
Effect of Temperature on Charging Voltage
As temperature rises, electrochemical activity in a battery increases. Similarly, as temperature falls, electrochemical activity decreases. Therefore, conversely, as temperature rises, charging voltage should be reduced to prevent overcharge,and increased as temperature falls to avoid undercharge. In general, to assure optimum service life, use of a temperature compensated charger is recommended. The recommended compensation factor for CL batteries is -3mV/oC/Cell (stand by) and -5mV/oC/Cell (cyclic use). The standard center point for temperature compensation is 25oC. Figure 1 shows the relationship between temperatures and charging voltages in both cyclic and standby applications.
Effect of Voltage on Battery Gassing
Although the batteries are of the recombination type and the amount of gassing at normal operating voltages and temperature is negligible, if the charging voltage is increased, gassing will occur despite the recombination design of the product. Gassing does not normally occur while the battery is operating under float conditions and normal constant voltage recharge of 2.25-2.30 Vpc at 25oC. Very little gassing occurs when the battery is recharged under normal cycling recharge procedures. However, it can be seen on the accompanying graph the higher voltages that this especially under conditions of constant current charging will substantially increase the volume of gas. of the biggest manufacturers of SLA (or VRLA) batteries in the world.
Discharge characteristic
The discharge capacity of a lead acid battery varies and is dependant on the discharge current. VISION CL VRLA batteries use a rate at the 10 hour rate. i.e.the capacity of the battery at 10 hours discharged to an end voltage of 1.80Vpc at a temperature of 25oC.
General Comments
The discharge curves (Figure 2) show the minimum design parameters for each fully charged VISION battery after installation. Full capacity is reached after some initial service.
Float Service.
One month after installation and recharging.
Cycle Service.
Within three to five cycles after initial charge and service entry.
Technical Terms
1. Battery capacity for VRLA batteries by accepted convention worldwide is described in "AMPERE HOUR" at the 10-hour rate C10 when discharged at 25oC. i.e. a CL200 is 200 Ah at C10 that is the battery will deliver 20 amps current for 10 hours to a cut off voltage of 1.80 volts per cell .
2. Battery cut-off voltage is the volts per cell to which a battery may be discharged safely to maximize battery life. This data is specified according to the actual discharge load and run time. As a rule of thumb, high amp loads and short run times will tolerate a lower cut off voltage (eg. 2C at 1.3V/C), whereas a low amps long run time discharge will require a higher cut off voltage (eg. 0.1C at 1.80V/C).
Battery Selection
The battery discharge graph (Figure 2) may be utilized in battery selection. However, it is suggested that a review is made of the data sheet for each battery type or the chart showing the actual ampere hour capacity of each battery type at various discharge times.
Effect of Temperature on Battery Capacity
The nominal battery capacity is based on the temperature of 25oC. Above this temperature, the capacity increases marginally but it must be noted that the working battery should be kept within the temperature design limitations of the product.
Below 25oC, the capacity decreases. This decrease in capacity becomes more prominent at temperatures below 0oC and in heavy discharge rates. Chart 1 illustrates the situation and the decrease in capacity with the decrease in operating temperature. Temperature must be taken into capacity design calculations in applications where the operating temperature of the system is below 20oC .
Product Standards