That is excellent, I just got the parts to make another 100 or so MeowToats when I do, I will list 3 units for sale that are designed for international shipping. Each unit will come with 25 meowToats and whoever buys them will be welcome to resell them in their country. Since I have had a few people ask about this. I should be able to keep shipping reasonable this way too.
The black PCBs are actually error PCBS, With enough work you can get the metal part put on them but this is why I am giving them away... They are functionally usable but require a lot of extra work.
So here is the thing about batteries as the die... The lose voltage so a 1.5v A battery will start out at about 1.5-1.7v but over time go all the way down to say maybe .7v before many things are like I can't use this... This is why old flash lights get dimmer as the it's battery dies.This is such a neat little product solving a real problem for the community! Thanks for making this available at a reasonable price. Just ordered a bunch for myself.
BTW, it'd be interesting too know if there are any particular Mac models (or other vintage machines) that are sensitive to the difference in voltage between your typical 1/2 AA lithium battery and a CR2032 (3.6V vs 3V), or other differences in electrical properties? Any experts here who would care to weigh in?