To power a DIY LED lab project for a group of inexperienced students, I was looking for an inexpensive, clean, and visually attractive solution to attach a Coin / Button battery to a LED circuit.
After trial and error, I found the following method of heat shrinking wire leads onto the Coin / Button battery terminals to be relatively easy and low cost along with conserving space, providing battery short protection, and was visually attractive.
For lack of a better name, I refer to it as a “Heat Shrink Coin & Button Battery Holder
Disclaimer: This “Instructable” is provided “As Is” without any express or implied warranty of any kind including warranties of merchantability, noninfringement, or fitness for a particular purpose. The Author of this “Instructable” does not warrant or assume responsibility for the accuracy or completeness of any information, text, graphics, links or other items contained within this “Instructable” post. In no event shall the Author of this “Instructable” be liable for any damages whatsoever (including, without limitation, lost profits, business interruption, lost information, or damaged electronic equipment and circuits) or be liable for any personal harm / pleasure / death whatsoever (including intentional or unintentional, without limitation, cuts, scratch, punctures, bruises, inhalation, swallowing, or insertions) arising out of the use of or inability to use this “Instructable”, even if the Author of this “Instructable” has been advised of the possibility of such damages or personal risks.
Summary of Procedures:
In short... Do your own engineering work and analysis of the approach for your specific implementation to determine validity, safety, and assume accountability for the outcome of your engineering assessment; assess and mitigate the risks specific to your scenario and skill level. Use good sense on how, where, and if to use this approach; if you are unsure, do not use it... I would have said common sense, but common sense is definitely not common.
- Getting your Materials (Parts & Tools)
- Get Parts: Coin / Button battery (size dependent on your project), 22 Gauge Solid Wire, Heat Shrink Tubing (diameter size dependent on your battery)
- Get Tools: Diagonal Cutters, Wire Strippers or Utility Knife, Needle Nose Pillars, Scissors or Utility Knife, & Heat Gun or Lighter
- Preparing the Wire Leads
- Cut 2 (qty) Wire Leads (22 Gauge) to desired length for your project
- Strip ends to roughly the length of the Coin / Button battery diameter
- Bend the exposed wire ends into a spiraling shape
- Preparing the Heat Shrink Sleeve
- Select Heat Shrink Tubing diameter that securely holds battery
- Cut piece of Heat Shrink Tubing roughly 1.5 times the length of the battery diameter to make a sleeve
- Inserting the Coin / Button battery into Heat Shrink Sleeve
- Stretch internal diameter of Heat Shrink Sleeve if needed
- Place Coin / Button battery into Heat Shrink Sleeve
- Inserting Wire Leads into Heat Shrink Sleeve
- Insert Wire Leads between battery and Heat Shrink Sleeve
- Applying heat to Shrink Sleeve
- Apply heat to shrink the Heat Shrink Sleeve securing the Wire Leads to the Coin / Button battery
I did attempt other approaches to secure a Coin / Button battery to a LED circuit; however, my results were mixed.
- Incorporation of a button battery holder: Due to confined space and the significant cost adder per project kit, I decided that a molded battery holder was not a viable option.
- Variety of taping methods (including some illustrated here on instructables): Taping was not giving me the clean look I desired. Nor was the taping method necessarily easy when attempting to position and secure two loose wire leads to the Coin / Button battery terminals as you wrapped tape around it by yourself.
- Solder directly onto the battery terminals: Soldering to the battery yielded limited success and I was concerned with my student’s ability to utilize this method along with any potential battery damage due to excessive heat. I did evaluate batteries with soldering tabs; however, I found them to be a significant cost adder compared to a regular bulk Coin / Button battery.
- Conductive glue / epoxy: Yielded similar frustrations as taping and came with the additional concerns around the chemical makeup.