Introduction: DIY 9V Battery Connector

About: Part software developer, part maker.

Hi Everyone,

In this Instructable, I’ll show you how you can make a 9V battery connector from an empty 9V battery.

9V battery cells have this connector that is basically reversible. You can if needed connect multiple batteries in series without using any additional connectors or wires as in this case of connecting 244 of them!

This connector consists of one female and one male pin that is the same on both the battery and the receiving connector so we can salvage them from the empty cells to make new connectors for our projects.


Step 1: Disassemble the Battery

To begin, we first need to remove the outer metal shell of the battery and the easiest way to do this is to grab a wire cutting pliers and start peeling it off from where it is connected, the same way as you would peal a meat can.

When peeled, we can remove the bottom plastic cover and this will expose the inner cell construction. An interesting thing about 9V batteries is that they are usually constructed out of 6 AAAA 1.5V cells so if you are in a need of such cells for a project you know where to get them. Depending on the battery manufacturer, the cells inside can be welded together but in my case, they were just press fitted together with a rubber gasket, so once I opened the case everything just fall down and the part that we are most interested in was not soldered or welded to anything.

Step 2: Solder Wires to the Connector

To make it as a separate connector, we need to solder two wires and to make sure not to mistake the polarity, it is best if you use another battery to determine which wire goes where. The connection needs to be made in such a way that what was the battery negative pole, will now be the connection for the positive wire and vice versa.

To connect the wires, we will add solder to both of the pads and this might take a while as they have a lot of metal to get hot, but after few seconds, the solder should attach nicely. TO test it that everything is OK, we can connect a battery to the now functional connector and with a multimeter, we can confirm that the polarity and the voltage are as we expect.

Step 3: Protect the Wiring

As a final measure of protection, we can use some hot glue to stick the bottom cover of the batter on the back of the new connector. This way we can be sure that whenever we use this connector, the battery will not get accidentally shorted by some metal part or wire.

In the end, we can add some more hot glue on the edge of the new connector to improve its mechanical strength and we can then start looking for a project where we can use this connector. If you enjoyed this Instructable, please check out all of my other ones and feel free to subscribe to my YouTube channel for more similar projects.