Boost Your Cheap, Battery-Powered Air Pump




So, are your batteries always draining so fast in your air-mattress pump? Well, there's an easy fix.

Step 1: Items Needed

1: Battery powered air mattress pump
2: Wall wart
3: Soldering iron
4: Solder
5: Hobby knife

The pump I used runs on four D cells. That's six volts, and I had just gotten a wall wart from an old cell phone that had an output of 4.9 volts. Since the voltage of the batteries the pump was running on had dropped below that voltage and the pump was still working, I decided the wall wart I had was good enough.

Step 2: Connecting the Wall Wart

This is really simple.
By looking into the battery compartment, you can see the battery terminals. Just follow the ones leading to the motor to determine the + and - of the motor.
Then, cut off whatever connector is at the other end of the wall wart, leaving as much wire on the wall wart as possible, and then strip the wires. Mine were colored black and red, so that was easy, but otherwise you can test the wires with a multimeter. Then, just solder the wires onto the motor + to + and - to -.

I was able to just run the wire out in the crack between the pump and the lid of the battery compartment, but depending on the type of pump you have, you may need to make a small notch for the wire.

Step 3: Finish

It is that easy! Just plug it in and it will* start.

*A little note though -- the output of my wall wart was only 450mA, and that doesn't run the motor on its own, so I still need to put batteries in it, but adding the wall wart does boost the performance. If you used a wall wart with a higher amp output, it would probably run the pump on its own. I might change my own if I find a better wall wart.



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    3 Discussions


    2 years ago

    You could have included the On/Off switch

    in your wiring plan. Looks like that switch will not affect

    the input from the Wall wart at all

    1 reply

    Reply 2 years ago

    Thats a good idea, but it would take a bit of rewiring of the switch to do as the switch on my pump was in the lid between the cathode of one battery and the anode of the next battery.