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I have three 10000µF 75V Aluminum Electrolytic Capacitors. The aluminum can has a very shallow dent. Would you think this is still safe to use them? I have three of them, and they are expensive

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  • \$\begingroup\$ This probably depends on how they got dented. Was it due to purely mechanical means or did it occur while they were being used in a circuit? \$\endgroup\$
    – Barry
    Commented May 1, 2018 at 23:41
  • \$\begingroup\$ Any chance to see a picture? \$\endgroup\$
    – user76844
    Commented May 2, 2018 at 5:21
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    \$\begingroup\$ we need to see a picture at least. ... there is no telling what you mean by shallow dent ..... there was a post once where the OP said that he may have scratched his cell phone battery slightly he posted a picture and it looked like a cat shredded it ... lol \$\endgroup\$
    – jsotola
    Commented May 2, 2018 at 5:54

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It would be best if you could test them with an LCR meter, but a shallow dent is probably not a problem. A bulge would be a whole diffent matter.

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  • \$\begingroup\$ A dent could be a big problem if the capacitor plate roll inside got compressed in a tight spot due to the dent location. \$\endgroup\$
    – Michael Karas
    Commented May 2, 2018 at 4:31
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The best test is measure leakage current at rated V using a large R to slowly charge it up or a low power <<8W light bulb rated for 120 V then compare with datasheet

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