Convert a Baby Swing From Batteries to AC (wall) Power




Are you tired of changing the batteries in your infant/baby swing?

This instructable covers how to convert your baby swing to wall power, so you can just plug it in and not have to change the batteries.

It's designed so that you can choose wall power or batteries, depending on your needs.

This Instructable requires soldering--There are other instructables covering that if you need help learning.

Step 1: Tools & Parts Necessary

Screwdriver(s)--Used to open up the motor/switch/battery housing
Wire Stripper/Cutter--Used to cut and strip the old and new wiring
Soldering Iron--Used to solder the new switch and wires to the existing wiring
Heat gun or Cigarette Lighter--Used to melt the heatshrink tubing

5 VDC Power Supply--I used an old cellphone charger. It needs to have a similar voltage output to the batteries in your swing. Count the batteries in your swing. Each one puts out 1.2VDC (Whether AA, C, D, ect). Obviously 9V batteries are a different animal. Mine used 4 "D" batteries, so I needed at least a 4.8VDC power supply.
Double Pole Double Throw (DPDT) Switch--A small one from Raido Shack, etc. is fine.
Solder--Used to secure the new wiring
Heatshrink Tubing--Used to protect the solder joints
Epoxy or Super Glue--Used to secure the switch to the housing

Step 2: Disassemble the Swing

The goal here is to get access to the wiring from the batteries to the motor. The exact technique will vary depending on manufacturer of the swing, but most of the time you you have to remove a number of screws. This will allow you to split the plastic housing of the swing to gain access to the wiring.

I had to remove about 10 screws in order to accomplish this. The picture shows the plastic housing split apart, and the battery box, and wiring visible.

There should be two wires leading from the battery box, a red wire and a black wire. This is the positive (red) and negative (black) power for the motor/sounds/etc.

Cut both of these wires. I chose to cut them equally distant from the battery box and the circuit cards for the motor. This gave me several inches of wire to hold onto when soldering, which is very helpful.

Step 3: Build Up the Switch

Take your DPDT switch and and solder approximately 4" long wires to the six switch leads. Once your solder has cooled, slide heatshrink tubing over the solder joints and shrink the tubing with a heat gun or lighter. I used a cigarette lighter since I don't have a heat gun.

The center two positions will be connected to the motor side wiring in the swing. One side of the switch contacts will go to the battery box wiring, and the other side will go to the new power supply.

The positive wires should be on one side of the switch (left or right), and the negative wires should be on the other side.

It does not matter which side goes to what power source, as long as the middle contacts go to the motor.

Step 4: Cut Hole in Housing for Switch

Lay out the size of the hole necessary to accomodate your switch and then remove that material.

I chose to drill the corners of the area with a small drill bit and then use a razor blade (multiple passes) to cut between the holes to make my rectangular cutout. I cheated and used my Dremel tool a bit, but the razor blade method works fine as well.

Step 5: Prepare Power Supply

I had an old Motorola cell phone charger with a similar (slightly) higher voltage.

Cut the cell phone connector end off, and strip back about 3/8" of the insulation to expose the copper wire.

Carefully separate the stripped ends and plug the charger into the wall. Using your multimeter, touch the red lead of your meter to one wire, and the black lead of the meter to the other wire. If the meter displays the correct voltage of the power supply (say 5.0 volts), then mark the wire the red probe is touching as the positive wire. I used masking tape to do this. If your meter says (-5.0 volts), then the wire the black lead is touching is the positive lead. Mark it as such.

You will need to figure out how to run the power supply wires through the plastic housing of the swing in order to connect them to the switch. I chose to drill a hole on the bottom of the swing, near the battery box. Drill a hole just large enough to fit the wires through. The tie a simple knot (overhand) in the power supply wiring on the inside of the housing to provide strain relief for the wiring. You DO NOT want the solder joint to be pulled on when someone trips over the wiring, etc.

Step 6: Connect the Wiring

Now its time to connect the switch wires to the motor wires, battery wires, and power supply wires.

Be sure to slide heatshrink tubing on the wires and push it away from the joints prior to soldering them. Once the joint has been soldered and is cool, slide the heatshrink tubing over the joint and shrink it with your heat gun/lighter.

Push the switch through the hole you've created and connect the switch wires to the appropriate wires--battery box, power supply, and motor.

I stripped the wires back about 1/2" inch and then "hooked" them together. (see picture). Basically I bent the stripped ends into a "U" shape and connected the "U"'s together. I then soldered them together. Note the white heatshrink tubing on the red wire. Once the joint is soldered, that will be pulled down and shrinked over the joint.

You will need to do this for all six wires.

Step 7: Reassemble and Test

Reassemble the housing and reinstall and tighten the screws that you removed.

Place the batteries in the unit, and plug the power supply into the wall.

Turn on the swing (with the switch in either position) and see if it works normally. Push the new switch the other direction and make sure it works normally.

I then glued the switch into the housing using epoxy (in the first picture it's under the masking tape, being held in place while the epoxy cures).

You can unplug the power supply and then determine which direction the switch has to be in for the power supply to power the swing motor.

Label the switch accordingly.

Enjoy not having to buy batteries!

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117 Discussions


Question 7 months ago on Step 1

I did this using a 5.0VDC 1.5A power adapter. I just bypassed the batteries since I have no desire to continue buying them. Everything works but it seems to be swinging slower now. Is it possible to use a different adapter with a higher current output to increase the speed?

1 answer

Reply 7 months ago

Yes, I found the same thing. Whereas I used to use say setting "3" on the swing on batteries, I needed to use setting "5" when using the power adapter.

A higher current power supply should solve the issue.


Question 1 year ago on Introduction

I converted a battery operated baby swing to a 5.5 volt cord from a cordless house phone it works but for some reason it keeps shutting off. Why would it keep shutting off

1 answer

Answer 1 year ago

Hey April, my guess would be that the adapter is not supplying enough amperage for the swing. Does the transformer (wall wort) list the amperage it supplies next to where it says 5.5 VDC?


1 year ago

I did this but
Used a 6v
Fisher price swing
With a Fisher price plug
But when it gets under load the lights pulse
I just put crimp ends and pushed into the battery terminals
So one could go back to batteries
If they wanted


2 years ago

hi am Prasad,

I have made a water level sensor which is basic though and previously it was running on 9v dc battery ,and so the started draining in 2 days,so if I want to supply or power my circuit on wall current what will I have to do

1 reply

Reply 2 years ago

HI Prasad You will need a power supply with a 9 VDC (9 volt DC) output instead of a 5VDC output like the one I used.

I don't know how much amperage your water level sensor draws, but a 1000mah 9 VDC power supply should be good.

Fortunately, these are easy to source. Here's one on Amazon:

Get one like this, cut the connector off, separate the positive and negative wires, and connect this to your water level sensor in lieu of the batteries.


2 years ago

hello, need some help.

I have an outdoor motion light in my drive way. it's using 4
C battery’s, and would like to get a wall adapter. What voltage adapter should I
get? I can get one that change from 3, 5, 6, 8, 10, or 12.

Thank you in advance.

-Anthony Mendonca

1 reply

Reply 2 years ago

Hi Anthony.

Do you know if your light uses LEDs? If so, it's most likely 5 volts, so use a 5 volt charger.


3 years ago

Thanks for making this instructable! After reading it through, I gathered the courage to mod our old D-Cell only baby swing with a 5v AC adapter. Feels good man. Cheers!


3 years ago

great idea and very useful,


3 years ago on Introduction

That's amazing idea. i enable me to save money of battery replacement. Thanks


4 years ago on Introduction

red side of the plug onto where the last batteries + side**

I just did this and it works great. Thank you for the great idea. Not too hard.


8 years ago on Introduction

I love this instructable!

I have this exact swing and the same exasperation with the repeated purchase of "D" batteries!

I do not know how to solder, however, so I probably won't try this at home. :-/

I have never seen a baby swing with an AC adapter and all the hand-me-down swings we got are battery operated. I looked for swings with AC adapters in local (Pittsburgh) stores and found none. My sisters actually didn't believe that they existed, and they almost had me convinced. We figured there had to be a law against them, because who would want a battery powered swing if plug-in swings were available?

Are you listening, Fisher-Price?! (Probably not. Sigh.)

3 replies

Reply 4 years ago on Introduction

Great instructable, but for those non-techies who read this and don't want to walk away feeling discouraged from trying it, I'd suggest taking a look at the Batsub TooL ( It makes doing this kind of stuff a snap, for both the techies and non-techies.


Reply 7 years ago on Introduction

My old swing was AC power or battery, but you could never find an AC adapter officially sold for it. I just went to radio shack and got one of those adapters you could change the voltage and the plug on..

It's a shame that they don't make both options.... It's probably a "safety" issue with having a corded product... they have to go through UL certification I think.. or something probably like that..


Reply 7 years ago on Introduction

try the mamaroo baby swing. its actually a better swing all together. it is pricey but its a great swing.