Guerrilla battery holder for your breadboard / Arduino projects

Picture of Guerrilla battery holder for your breadboard / Arduino projects
I am experimenting with the DS1307 and the Arduino, I had to find a way to connect a CR1212 battery.
I rummaged into my connectors box, and found nothing that could help. Then, eurêka! I had an illumination...
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Step 1: You will need...

Picture of You will need...
- one CR1212 3V battery
- two rows of a double row .100" regular "snap-off" headers

Step 2: Slide it gently but firmly

Picture of Slide it gently but firmly
The terminals are snap-of dual .100" headers. I was out of wire-wrap headers, so I pushed (hard) to slide the plastic part about midway through the terminals so they fit perfectly in a breadboard, have the right width, and stick out enough to hold the battery somewhat securely.

Be careful with your fingers, these terminals can and will break your skin if you push hard enough!

Step 3: And voila!

Picture of And voila!
Be careful with the polarity. The part with the engraving is the +.
When using a breadboard, make sure your are not shorting the battery (the battery should be parallel to the contact lines).

On another line of thoughts, I added a small 1uF capacitor in parallel with the backup battery connectors on the chip (not pictured). It gives you enough time to change the battery without losing the time.
kiranjose4 years ago
great idea..i did it with a cr2032 and two single row headers :-)
iectyx3c4 years ago
This is a great tip.

Thanks pcairic.

I'm gonna mod it for my Galaxie 500 battery box ;-)
pcairic (author) 5 years ago
 Thanks guys!
nadav5 years ago
 great instructable, rated 5 stars
me5 years ago
that is great, incredibly simple but very effective, thank you for this solution