Review on 🔋 Long-Lasting LOOPACELL 50 D389/390PK Watch/Electronics Battery - 1.5 Silver Oxide Power Solution by William Whisperer

I use them for bike lights, the Florida humidity eats it all away and they need new batteries about every 3 months. With 12 batteries every 3-4 months, the more the better. I tested them with a multimeter after 3 months and they only dropped 0.8 volts. I did a little research and as far as I can tell all silver oxide batteries are the same so buy as many as you can for the lowest price per battery (that's it!)