A: Answer I own 2 of these exact units and plan to buy a third for my new power desktop computer and have not sensed an unusual smell from the units themselves at all. I think I read one of the answers for this question above about the plastic that is supposed to be taken off by the consumer after purchase and wonder if this plastic may not have been fully removed by the asker of this question, I could imagine a scenario where plastic left on the power supply could cause an increased odor. Just to help with answering this question, but I have a very strong sense of smell which is honestly quite annoying and causes me to be annoyed by odors very easily so if I wasn't annoyed by an odor, then it must have been quite small. But to add one further thing to this answer, I would ask users that buy these power supplies to run a check of the backup battery in order to make sure that the fan that is inside the unit performs correctly. Of the two products above had a fan that was catching on something inside the unit so it required pushing and stretching certain areas of the backup battery and adjusting the position it was in in order to A figure out it was a fan causing the issue and B to resolve the issue. A test can be run of the backup battery by pressing and holding for 3 to 5 seconds the third button on the right call Control. There is a fan sound the starts up a couple seconds after the backup battery buzzing sound created when it goes into battery power inverter mode. I literally ran a test about a minute ago and while not annoying from a few feet away the fan still catches a little compared to the second unit which is essentially whisper quiet. Though I only found out the one unit with the fan catching sound was a problem because I ordered two identical units. Sorry for the little bit of extra info, but I wanted to try and help out anyone who may have encountered the same issue. One final thing I have owned a multitude of backup batteries both CyberPower and APC.

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