system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do most electronics, like controllers and remotes, need two batteries instead of one?
gpt
Modern electronics operate off of semiconductors. Diodes and transistors. This includes LED's. These are electronic devices which do almost nothing below a set voltage. Only above this voltage do they become active.

While the exact voltage can vary, this would usually be near or above the voltage of one battery (1.5 v). So, to get some function out of them, the voltage must be raised a bit. The easiest way to do this is to add a second battery.