Applications

VT series VRLA (Valve Regulated Lead Acid) technic sealed batteries are specially designed for cyclic and standby use, where a weight, available space, and durability count. 

Features
► Capacity range up to 250AH
► Voltage 2V, 6V and 12V
► Low self-discharge rate : less than 3% per month
► High sealed efficiency : more than 98%
► Wide operation temperature : -20°C to 45°C
► Long design life and good discharge & charge performance
► Plate: Positive and Negative grid plate use Pb-Ca alloy
► Container: ABS resin for durability against impact and shock proof
► Compliance IEC 61056
► Approved ISO 9001, ISO 14001, UL and CE
 
Cyclic Life
There are a number of factors that affect the length of cyclic life of a VT battery. Major factors are the ambient operating temperature, the discharge rate, the manner in which the battery is recharged, of which the most important is the depth of discharge.
 
Float Life
6V, 12V Series
VT batteries are designed to operate in standby(float) use up to 5 years on a normal service condition in which float charge voltage is maintained between 2.25 and 2.30 volts per cell in an ambient temperature of approximately 25°C(77°C). Figure 7 shows the float life characteristics of VT batteries when discharged once three(3) months up to 100% depth of discharge.In normal float use, where charging voltage is maintained 2.25 to 2.30 volts per cell, gas generated inside a VT battery is recombined into the negative plates, and return to water content of the electrolyte. Electrical capacity therefore is not lost due to “drying-up” of the electrolyte. Through gradual corrosion of the electrodes, the battery will eventually lose capacity and come to an end of life. It should be noted that the process will be accelerated by higher ambient operating temperatures and/of higher charging voltages.When designing a float system, one must bear in mind that length of life will be directly affected by the number of discharge cycles, the depth of discharge, the ambient temperature, and the charging voltage.