AA/AAA Mock Battery Powered from USB or AC adapter (battery adapter/eliminator)

Eliminate the AA/AAA batteries

Remove the batteries from your gadget and put this mock batteries with a mock USB plug attached.

Then, you can use the gadget without batteries, powered from a USB port.

What is it actually?

This model is merely a mock battery which has empty electrodes on both ends.

If you wrap bear conductor wires around the empty electrodes a few times, and put the mock battery in your gadget, the wires have electric contacts with the electrodes of the gadget.

Then, you can connect the other ends of the wires to some power supply, i.e. a USB port or an AC adapter, to power the gadget from the power supply, instead of the AA/AAA batteries.

Is it safe?  >>>  !!! DEFINITELY NO !!!

I warn you that it is, in general, VERY DANGEROUS to do this.

It may cause fire if the power is supplied in wrong way or the power cable somehow makes a short circuit.

Do it at your own risk after carefully checking the safety.

Why does it work?

When your gadget uses three AA or AAA batteries, almost always they are serially connected. So, its working voltage is 4.5V, which is not too far from the USB power voltage 5.0V. This is why some gadget can be powered from a USB port.

If your gadget uses four AA or AAA batteries and it also works with NiMH rechargeable batteries, often it can be powered from a USB port without problem because it works with both 4.8V (= 4 x 1.2V) and 6.0V (= 4 x 1.5V).

Similarly, if you have an AC adapter with 3.3V output, you may power a gadget with two AA or AAA batteries with the AC adapter.

But I repeat, it is dangerous to do that in general.
Unless you understand the electronic circuit in the gadget, do not do it.
 

Remixed from "AC Adapter Adapter (AAA)"

I got the original idea of this model from "AC Adapter Adapter (AAA)" by turner3d. 
I sincerely appreciate for it.

Compared to the original model, I made the adapter bipolar and monolithic. I also designed the polarity of the mock battery more visible by making the positive electrode protruded.

Printable USB power connector

john3volts3 provides printable USB power connectors, which can be usefully used with the present model.

• USB to Dupont adapter for power supply 5V Arduino Raspberry Pi (Remix) 
• USB to Dupont adapter for 5V FEMAL
   

Printing

Two mock battery models for AA and for AAA, respectively, are provided.
They are printable with 0.4mm nozzle with 0.2mm layer height without support.

The model comes with dedicated easily detachable brims. Cut them off after printing.
 

In order to make them more detachable, apply “split to objects” to split the brims from the models before slicing.

Then, the brims will be printed separately from the models (left).
Otherwise, the brims will be printed as a part of the models (right).

Happy printing!