How accurate is battery quick testing?

How accurate is battery quick testing?

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The secret of battery quick

testing lies, to a large extent, in understanding how the battery is being loaded. Battery loads vary from

short current bursts for a mobile phone using the GSM protocol, to long and

fluctuating loads on laptops,

and to intermittent heavy loads for power tools.
Because of these differences in loads, a battery for a digital mobile phone should

be tested primarily for low impedance to assure a clean delivery of the current bursts,

whereas a battery for a notebook

should be examined mainly for the bulk in energy reserve. Ultra-low impedance is of

less importance here. A battery for a power tool, on the other hand, needs both — low impedance and good power

reserve.
Some quick testers simulate the equipment load and observe the voltage

signature of the battery under these conditions.

The readings are compared with the reference settings, which are stored in the tester. The

resulting discrepancies are calculated against the anticipated or ideal settings and

displayed as the SoH readings.
The first step in obtaining quick test readings is measuring the battery’s internal resistance, often referred to as

impedance. Internal resistance measurements take only a few seconds to complete and provide

a reasonably accurate indication of the battery’s condition, especially if a reference

reading from a good battery is available for

comparison.
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