Which is most powerful 2 double A batteries or 3 triple A batteries?

Two AA batteries generally provide more power than three AAA batteries. This is because AA batteries have a larger capacity and can deliver higher current due to their greater size. While both types of batteries are typically 1.5 volts, the overall energy capacity (measured in milliampere-hours) of two AA batteries is greater than that of three AAA batteries. Therefore, for applications requiring more power, AA batteries are usually the better choice.