![I see the Duracell power check batteries posted often but no one seems to remember the Copper Top Tester. I recently found my old one. Tested it out with a new battery. : I see the Duracell power check batteries posted often but no one seems to remember the Copper Top Tester. I recently found my old one. Tested it out with a new battery. :](https://external-preview.redd.it/E_QVJMZ-tRLf9GwgS-bOdbGdVOD6yMj2YECm8uIDuso.png?format=pjpg&auto=webp&s=be4f9de3d250211d8eb2904a72ddb35223bd173d)
I see the Duracell power check batteries posted often but no one seems to remember the Copper Top Tester. I recently found my old one. Tested it out with a new battery. :
![Duracell PowerCheck batteries: More bruised fingers than at a bass players' convention : r/nostalgia Duracell PowerCheck batteries: More bruised fingers than at a bass players' convention : r/nostalgia](https://external-preview.redd.it/9RIeOwv0nfAFQy7tzhD0KDB0xUoisCsk5mbJ1TUFH5A.jpg?auto=webp&s=2b36db1889f9554a8c5dcdd08fc950f44b234e99)
Duracell PowerCheck batteries: More bruised fingers than at a bass players' convention : r/nostalgia
![A popular application of thermochromic material is the test strip on the side of a battery. The strip is pressed at each end… | Duracell, Nostalgia, Smart materials A popular application of thermochromic material is the test strip on the side of a battery. The strip is pressed at each end… | Duracell, Nostalgia, Smart materials](https://i.pinimg.com/736x/6c/2c/7a/6c2c7a8de2ad5ad66512110d00fbb619--funny-images-funny-photos.jpg)