Haraknos

Request : getting rid of batteries in devices

https://lemmy.world/post/2696268

Request : getting rid of batteries in devices - Lemmy.world

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 !

Aug 5, 2023 at 11:17amWeb
Show threadrealitistaAug 5, 2023

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 500w ac adapter and wire it in and it would run. But you’d need to understand some basics about electronics and soldering to do AO.

Show threadNoRodentAug 5, 2023
500W adapter for hair clippers? What would you be clipping, woolly mammoth?
Show threadrealitistaAug 5, 2023
Lol, corrected.
Show threadHaraknosAug 5, 2023
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…
Show threadrealitistaAug 5, 2023
Resistors don’t reduce voltage, so no, that won’t work. You need a 3v dc power supply (probably unless batteries are in parallel).
Show thread4lanAug 5, 2023
1.5W
Show threadNoRodentAug 5, 2023
The comment originally said “500W” instead of “500 mA”.
Show threadfuckwit_mcbumcrumbleAug 5, 2023

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.

Show threadNoRodentAug 5, 2023

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.

Show threadbighatchesterAug 5, 2023
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
Show threadDrunkenMasterAug 5, 2023
This one? www.youtube.com/watch?v=bTpKM43VhwA
I HATE Batteries! - Converting Wireless to Wired (a cheapskate’s guide)

YouTube
Show threadTimeNaanAug 5, 2023
It’s a good video but for powering simple removable battery devices. It’s different for ones that have cells and charging/protection circuitry.
Show threadHaraknosAug 5, 2023

Thanks, I found the link, i’ll see what I cando with that !

Converting Wireless to Wired

I HATE Batteries! - Converting Wireless to Wired (a cheapskate’s guide)

YouTube
Show threadyesterdaysheroAug 5, 2023
It could be worth cross posting this to [email protected]
Show threadelmichaAug 5, 2023
Did you already try to remove the batteries, without making a bridge?
Show threadCoeusAug 5, 2023
The easiest solution is to buy wired clippers for $35 and be done with it.
Show threadanlumoAug 5, 2023
Careful with attaching things connected to your skin with live. If there’s any fault, you’re going to be electrocuted, unless there’s an isolating transformer with good isolation in the circuit.