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There are special battery measuring instruments to judge the quality of batteries
,
But ordinary users rarely have such instruments
,
They only have a multimeter

The following are some summary points for judging the quality of the battery during maintenance
,
For reference

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br/>. Judgment based on the appearance. Observe whether there are deformations, protrusions, leaks, cracks, explosions, burns, or oxide seepage at screw connections.
. If there is no abnormal appearance during the load measurement,
working in battery mode with a certain amount of load, if the discharge time is obviously shorter than the normal discharge time, it will not be restored after charging for
hours. Normal backup time determines battery aging.
, Use a multimeter to measure
. Measure the voltage of each battery terminal in the battery pack in battery discharge mode. If the voltage of one or more battery terminals is significantly higher or lower than the nominal voltage (nominal voltage /
Section Determine battery aging.
. Measure the charging voltage of each battery terminal in the battery pack in mains mode. If the charging voltage of one or more batteries is significantly higher or lower than other voltages, determine the battery aging. .
. Measure the total voltage of the battery pack. The total voltage of the battery pack is significantly lower than the nominal value (taking the
nominal value of the battery pack as an example: it cannot recover after charging for
hours. to the normal value. Even if it returns to the normal value, the discharge time does not reach the normal discharge time, and the battery is judged to be aging.
, Battery power-on measurement
Do not turn on the phone, and do not connect to the mains. Use a multimeter to measure the battery pack first. The total voltage, taking
as an example, the voltage may be between
at this time, which is a normal value. Do not leave the test leads, keep an eye on the multimeter's instructions, and then connect the power button. If the total battery voltage is immediately If it drops below
or even more than ten volts,
it will automatically shut down immediately. After shutting down, the voltage will immediately return to its original value. It is judged that the battery is aging.