Today I did touch for a first time in my life, one of those 1.5V AAAA alkaline.
Looks like that HP & Microsoft using those 1.5V AAAA alkaline as part of their tablet stylus pointers.
In a way it looks that this spesific aplication managed to enter in the most common battery types this new AAAA member.
The below image serves for size comparisons.
![](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/6_most_common_battery_types-1.jpg/800px-6_most_common_battery_types-1.jpg)