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How to distinguish the quality of Panasonic battery?

Panasonic battery is also good or bad. Do you know how to distinguish the quality of Panasonic battery? Here is a detailed introduction:
1. Judging from the appearance: observe whether the appearance is deformed, protruded, leaking, cracked, fried, burnt, and whether there is oxide exudation at the screw connection.
2. On load measurement: if the appearance is normal, the ups works in battery mode, with a certain amount of load, if the discharge time is obviously shorter than the normal discharge time, after 8 hours of charging, the normal standby time cannot be restored, so the battery aging is determined.
3. Measure with Multimeter:
A. Measurement under battery discharge mode: measure the voltage of each battery terminal in the battery pack. If the voltage of one or more battery terminals is obviously higher or lower than the nominal voltage (nominal voltage 12V / section), judge the battery aging.
B. Measurement in mains mode: the charging voltage of each battery end in the battery pack. If the charging voltage of one or more batteries is obviously higher or lower than other voltages, the battery aging is determined.
C. Measure the total voltage of the battery pack: the total voltage of the battery pack is obviously lower than the nominal value (take the nominal value of the c1k battery pack as an example). After 8 hours of charging, it can not be restored to the normal value. Even if it is restored to the normal value, the discharge time can not reach the normal discharge time, so the battery is judged to be aged.
D. Battery power on measurement: UPS does not power on and does not connect to the mains power. First, measure the total voltage of the battery pack with a multimeter. Take c1k as an example. At this time, the voltage may be between 36V and 40V, which belongs to the normal value. Do not leave the probe. Keep an eye on the indicator of the multimeter, and then connect the power on button. If the total battery voltage immediately drops below 30V or even more than 10V, ups will automatically shut down and power off immediately The pressure immediately returns to the original value. Determine battery aging.

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