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Powersonic Brand Specifications

Cyclic Use

The number of charge/discharge cycles depends on the capacity taken from the battery · a function of discharge rate and depth of discharge · operating temperature and the charging method.

Power Sonic Batteries

Figure 3 shows the relationship between depth of discharge and number of cycles, but also the capacity increases during the early cycles.

Standby Use

The float service life, or the life expectancy under continuous charge, depends on the frequency and depth of discharge, the charge voltage and the ambient temperature.

At a float voltage of 2.27·2.30 v;cell and an ambient temperature of 20·25 • c. POWER-GUARD Series 6V & 12V batteries are designed to yield a service life of up to 10 years before the capacity drops to about 60%.

The graph in Figure 5 shows life characteristics in float (standby) service for ambient temperatures ranging from 15-55 • C.

If prevailing ambient temperatures are well above 20·25 • C the life expectancy of this type of battery in float service depends greatly on temperature compensated charging. The typical temperature coefficient is ·3mV/cell/"C". The graph in Figu re 5 is based on temperature compensated cha rging.

Effects of Temperature

Actual capacity is a function of ambient temperature and rate of discharge. At 68•F (2o•q rated capacity is 100%. Above this temperature capacity increases, below it capacity decreases as temperature falls.

While raising ambient temperatures increases capacity, it also decreases useful service life. It is estimated that battery life is halved for each 1o•c above normal room temperature.