Battery Selection Process

When battery is selected, it is taken into account the capacity and starting power value. Capacity refers to total power of battery while starting power value refers to instantaneous power. For example, if it is written 50 ampere hour and 420 ampere on a label; this means that battery has 50 ampere hour capacity and it has 420 ampere starting power. 420 ampere refers to instantaneous maximum current amount while 50 ampere refers to total power.  

Starting power value is written on the label based on the standard specified by the manufacturer. When we make product comparison, we should know the standard that starting power is written accordingly. There are some abbreviations included on the label. For example, EN refers to European standard while DIN refers to German and JIS refers to Japanese standard.  Please remember that these values are valid when battery is 100% full. As battery is a sell-discharging product, if a battery is kept in stock for a long time, such battery will not provide the values specified in the label. That’s why it is important to start to use the battery before its shelf-life expires.

Another important issue about battery selection is choosing a battery which has appropriate capacity and starting power for the vehicle. If we choose a battery with lower capacity and starting power than the vehicle – for example if we choose 60 ampere instead of 60 ampere -; we may not notice any problem in the short term but in medium term we will have problems about starting power of vehicle as 60 ampere hour has lower starting power than 72 ampere hour. If we choose a battery who has higher capacity and starting power than the vehicle has, then it should be measured the electricity i.e. charge voltage values of the vehicle. If the result of this measurement shows that alternator capacity is not powerful enough to feed the battery and the system, battery will never be charged that it actually needs and this will adversely affect to battery performance and life.
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