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I’m trying to figure out how to make arduino UPS (when the power goes down it should not reset the arduino). Or preferably buy something that will do that for me. I found this, but Im not sure of it will work. I will normally be using power from the outlet, but in case of power outage, I want it to run on the 3,7V li-pol battery (best would be if arduino could somehow know that its running on battery) What solution would you recommend to me?

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    There are charger modules, which provide power passthrough. I'm not sure if they can provide uninterrupted power during switching, but a large capacitor may help with that depending on the needed current
    – chrisl
    Aug 27 '21 at 16:05
  • @chrisl and could the arduino somehow know if its running on battery or from the outlet?
    – krystof18
    Aug 27 '21 at 16:48
  • @chrisl well i guess i could just power up radio transciever “directly” from the outlet
    – krystof18
    Aug 27 '21 at 16:51
  • That unit does not properly charge a li-pol battery and it states that. It appears it probably would work for Ni-Cad or Pb-Acid batteries. My recommendation is get a unit designed for the batteries you are using with power pass through. Also how do you regulate it for your arduino, a boost module of some type? Showing a schematic, not a frizzy thing would help a lot.
    – Gil
    Aug 28 '21 at 19:00

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