Why can't the new and old UPS power batteries be used in series

by:Power Kingdom     2021-06-18
Label: Yesterday, our company received a critical consultation from a customer, saying that his UPS power supply was unusable after replacing it with a new UPS battery in less than half a year, and asked if the quality of the battery we gave him was defective. After our technicians understand, the original customer’s UPS power supply is connected in series with 6 UPS batteries, but the UPS batteries he replaced are not all new, which means that the battery of his UPS power supply is a combination of new and old batteries. In fact, the use of new and old UPS batteries in series is quite common, but in fact, this approach will greatly shorten the battery life. Because the new UPS battery contains more chemical reaction substances, the terminal voltage is higher, and the internal resistance is small (the internal resistance of the new 12V battery is only 0.015-0.018Ω); while the old UPS battery has a low terminal voltage and large internal resistance (12V old battery). The internal resistance of the battery is above 0.085Ω). If the new battery and the old battery are mixed in series, the charging voltage at both ends of the old battery will be higher than the charging voltage at both ends of the new battery in the charging state. As a result, the new battery has not been fully charged and the old battery has been charged too high; in the discharged state Because the charge capacity of the new battery is larger than that of the old battery, the result is that the old battery is over-discharged, and even the old battery is reversed. Long-term reverse polarity will cause the battery to explode. Therefore, the UPS battery must not be mixed with new and old ones. In addition, UPS batteries of different capacities cannot be mixed. At the same time, the service life of UPS batteries will be shortened.
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