Version: 2020-09-04
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- Overheating and acute fire hazard.
Which defects occur exactly depends on the type of battery as well as the basic conditions. Overloading should, if possible, be avoided
for these reasons.
Deep discharge
During deep discharge, a cell of a battery is discharged during use until a complete depletion. In case of a deep discharge, the voltage
drops below the final discharge voltage, a condition in which a wide variety of defects may occur. Depending on the type of battery even
a single deep discharge can damage the battery internally so that it can lead into a total failure or even a polarity reversal of the battery
contacts.
Reloading damaged battery can be very dangerous because the reaction to the charging current unpredictable:
Although the battery is faulty, it initially appears to be responding normally to the charging process initiated by the UPS - a creeping
malfunction can appear up to 16 hours after charging is complete. Everything may happen, starting at an acute overheating when
starting or during charging process as well as a seemingly sporadic phenomenon during charging that leads creeping into a fire issue
many hours later.
Note
Typically, a UPS will stop operating in time to avoid this deep discharge, but overvoltage or undervoltage that weaken the cells, cannot
be detected the UPS.
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