Hello,

I have a problem with most of my equipments, and it’s because they are battery operated. I would really like to remove the batteries once they die, in order to replace them with a cable plugged to the sector.

For example, I have right now a hair clippers that can totally run if it’s wired and if the battery is okay, but refuses to run once the battery is dead, even plugged in.

I have only basic electrical knowledge amd I’m afraid to simply make a bridge to replace the batteries. Would someone of you know what is the best/easiest solution ?

Thanks for your attention !

  • realitista@lemm.eeEnglish
    19·
    1 year ago

    Most could be replaced with an AC adapter wired to the battery terminals. You’d need to understand the voltage and amperage needed for each device.

    Usually (but not always), something with 2xAAA batteries as pictured runs on 3v, so you could get a 3v probably around 500 mA ac adapter and wire it in and it would run. But you’d need to understand some basics about electronics and soldering to do it.

        • Haraknos@lemmy.worldOPEnglish
          1·
          1 year ago

          Would it be relevant to use the convertor delivered with the clipper and add some resistors to match the required voltage ? The converter output is 5.9V dc 500 mA, so I would “only need to” reduce the voltage somehow…

    • fuckwit_mcbumcrumble@lemmy.worldEnglish
      9·
      1 year ago

      Those don’t look like AAA batteries. They look like 18650 or some other sized lithium batteries which are far FAR more dangerous. A short in even a “discharged” battery could cause a fire.

      Op would need 4.2v (x2) to get the same voltage, and depending on the device god knows how many amps those batteries are capable of delivering.

      • NoRodent@lemmy.worldEnglish
        1·
        1 year ago

        Those don’t look like AAA batteries. They look like 18650

        Except on the battery you can clearly read “SUPPO HS-AAA0.75”, which is indeed a NiMH 1.2V AAA battery with 750 mAh capacity.

  • fuckwit_mcbumcrumble@lemmy.worldEnglish
    8·
    1 year ago

    Hair clippers are probably a good example of something where you’d want to replace the batteries and not just remove them.

    Lithium ion batteries are typically rated to discharge at 2-4 times their capacity. So a 2.5Ah cell is rated for 20 amps, but if you run into something tough it will easily deliver far more amps than that.

    Those cells look like they’re wired in series so they’d want 8V at potentially 20+ amps which is not a small amount of power to run some wires to.

    Without prior experience I would not mess with anything with a lithium ion cell.

    • yimby@lemmy.caEnglish
      3·
      1 year ago

      Uhh, something tells me hair clippers are not pulling 160+W. It’s a small DC motor that vibrates some clippers, not an electric scooter.

      • fuckwit_mcbumcrumble@lemmy.worldEnglish
        6·
        1 year ago

        You’d be surprised how much current a stalled motor will draw. It’s only going to be drawing that power for a short period of time though, not continuously like a scooter would.

        They’ll run with less power, just expect them to struggle more.

  • bighatchester@lemmy.worldEnglish
    71·
    1 year ago

    Linus Tech tips actually had a video on this recently where he removed the batteries from many small electronics in his house and showed how to power without batteries. Not sure what it was called but was probablyike 6 months ago