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I have a project that consumes a maximum current of 1.6A, that requires the use of a small LiPo battery. I have one that has the perfect size, but has capacity of 400mA, and a discharge rating of 1C (400mA maximum.) I understand that the internal resistance of a battery is what causes them to heat up under heavy current draw, but would battery thermals be the only risk when drawing 1.6A from a 400mA LiPo battery?

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  • \$\begingroup\$ Terminals? Probably not, but excessive heating internally and you soon have a thermal runaway. \$\endgroup\$
    – winny
    Apr 11, 2022 at 20:52
  • \$\begingroup\$ " a discharge rating of 1C " is your answer. \$\endgroup\$
    – user16324
    Apr 11, 2022 at 21:11
  • \$\begingroup\$ Well, you will get high temps, and reduced capacity on every cycle, and reduced cycle life. There could be some hazard. \$\endgroup\$
    – user57037
    Apr 12, 2022 at 0:44
  • \$\begingroup\$ Assuming it's capable of 4C the cycle life will be very much reduced if often at 4C and and somewhat reduced if usually at 2C with some 4C peaks. Others have mentioned thermal issues. \$\endgroup\$
    – ATCSVOL
    Apr 13, 2022 at 0:49

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Li-PO batteries made for model airplanes and drones are rated for up to 45C. Here is a cheap one rated for 25C:

enter image description here

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  • \$\begingroup\$ AliExpress sells VERY cheap Li-PO batteries with NO C rating. \$\endgroup\$
    – Audioguru
    Apr 11, 2022 at 23:53
  • \$\begingroup\$ This doesn't really answer my question, or help my use case. My battery needs to be under 40mm x 40mm, and I feel like most LiPos are 2C max \$\endgroup\$
    – Jay
    Apr 12, 2022 at 0:03
  • \$\begingroup\$ @jay please include dimension spec in the question and any other relevant information. \$\endgroup\$
    – ATCSVOL
    Apr 13, 2022 at 0:50
  • \$\begingroup\$ I have never seen a 400mAh Li-PO that is only 40mm x 40mm and with such a weak output current as 2C. \$\endgroup\$
    – Audioguru
    Apr 13, 2022 at 2:00

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