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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...

Step 1: 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

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!

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.
<p>Awesome idea...I came up with mine using a wooden clothesline clip and a little bit of conductive tape stuck on either side..</p>
great idea..i did it with a cr2032 and two single row headers :-)
This is a great tip. <br><br>Thanks pcairic.<br><br>I'm gonna mod it for my Galaxie 500 battery box ;-)
&nbsp;Thanks guys!
&nbsp;great instructable, rated 5 stars
that is great, incredibly simple but very effective, thank you for this solution

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