subject: How to discover the true health of your battery? [print this page] How to discover the true health of your battery?
The test of AC conductivity was introduced in 1992 as a new way of measuring the CCA (Cold Cranking Amps = Current cold start) of a car battery. This non-disruptive method has been acclaimed and regarded as a breakthrough and, to a large extent, eliminates the discharge test to measure the performance of the a1185 battery . The test only takes a few seconds, the readings are displayed as digital numbers and a message indicating the status of the battery. There is no spark occurs at the terminals of the battery and the instrument does not heat.
But the single frequency AC conductance has its limitations. It does not measure the CSF according to SAE standards and provides an approximation about the power of the Pavilion ZV5000 battery can provide energy (output). The figure on how much energy often varies with the state of charge (SOC = State of Charge), and other battery conditions. Sometimes, a good battery fails and one that is defective passes the test but by mistake. But his most important drawback is the inability to perform the reading of the reserve capacity (RC). Despite these shortcomings, the AC conductance has become an accepted standard for predicting the lifetime of the battery and to determine when to replace an old battery before it causes you problems.
Figure 1: Battery with high CCA and reserve capacity of 100%.A battery with a CCA rate may be compared to a large open tap that allows a free flow. What are the main differences between the parameters CCA and RC? A high reading of CCA provides good conductivity of the battery and provides a high capacity / ability to boot. A high CSF is associated with a low internal resistance of the battery. Figure 1 compares high CCA with a large open tap that allows a free flow.
The reserve capacity governs the amount of energy a battery can accumulate. A new battery is indicated by the manufacturer as having a nominal capacity of 100%. When the battery gets older, the reserve capacity drops and eventually it needs to be replaced when the reserve capacity falls below 70%. Reading RC always refers to a fully charged battery, the state of charge (SoC) should have no effect on the measure.
It is possible that a battery provides a good reading of CCA and starts well a vehicle while having a low reserve capacity. But the latitude d630 batterywill discharge rapidly if we tried to extract extra energy (eg. For accessories). Figure 2 illustrates such a battery. The so-called "content rocky" which accumulates when the battery ages is permanent and this process is irreversible.
Figure 2: Battery with high CCA but a low reserve capacity. Starting with this battery is good but a withdrawal of additional energy will drain the battery quickly
