Use Cheap AA Batteries Instead of Expensive 9 Volt Batteries
We were fed up with buying expensive 9 Volt batteries so made a cheaper alternative. We up-cycle an old 9 Volt battery to make the connector.
Here we show you how to make one cheaply, and demonstrate what we made. All equipment used you may find lying around your house or in an old toy etc... but if not we're talking pence & pounds to purchase.
- Video Demonstration
- The Plan
- Connecting Your AA Batteries
- The Home Made 9 Volt Clip
Most of the equipment used in our videos can be found on Amazon, we have an affiliated partnership with Amazon, any money we make goes into our University or College fund.
- 1.5V AA Batteries (4-6 batteries, depending on your desired output voltage)
We got a 32 pack of 1.5 Volt AA Batteries for only £2 (from PoundLand) - compared with the Duracell 9 Volt Battery that cost £7, this is going to be a lot cheaper no matter how the project turns out.
Free Battery Clip
You can pick up 9V battery clips cheaply, but we up-cycled one from an old battery which turned out better than a bought one.
We realised we could buy over 30 cheap 1.5 Volt AA batteries for less than the price of just one 9 Volt battery. So, we decided to use 4 of these 1.5V AA batteries (with a total 6V) to replace the expensive 9V battery.
If you wanted 9 Volts, then you have the option of including an extra 2 batteries in your project.
We were hoping the power supply we're about to make (made up of AA batteries) would last longer that the 9V since the overall volume was larger - so far, the one we have created is yet to need a replacement battery!
Connecting Your AA Batteries
We used 2 AA battery holders back to back which gave us a similar shape to the 9Volt battery space in our mini Amp.
There are a variety of other options, you can get holders that take 1, 2, 3, 4, or 6 batteries. You can make your own or 3D print them but they are very cheap to buy.
Connect in Series
We hooked up a multimeter and connected our 2 holders in parallel just for fun and got 3.1 Volts but we want 6 Volts so connected them in series. (You would expect double the battery life with them in parallel delivering 3.1V)
In series we expected 6.2 volts and this is what we got.
- You need to connect the red/positive from the 1st pack to positive out.
- The black/negative from 1st pack connects to the red from the 2nd pack.
- The remaining black/negative from the 2nd pack is your negative out.
In the photo below we have the red and black wires cut and stripped ready to solder together. The yellow sheath is the heat shrink we use to insulate the join. You can see the bag it came from.
Be sure to slide the heat shrink on before you solder!
The Home Made 9 Volt Clip
All that remains is to connect your 9 Volt clip, which you can buy but it's more fun and interesting to make one.
We used pliers to take off the metal casing of an old 9 Volt battery. Using gloves and a newspaper to avoid any nasty chemicals.
We discarded most of the battery, but kept the connector and the plastic base. We took off the metal and cardboard which were joined to the connector.
You solder the remaining 2 wires to the clip you just recycled from the old battery. Red/Positive to the rounded connector and the Black/Negative to the bigger hexagonal connector.
The black plastic you saved can be hot glued to the back, making a really neat and strong 9 Volt battery clip.
Now you're done and ready to start saving money. Please share this article if you found it useful and be sure to subscribe and follow our social media channels.