system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are batteries inserted in opposite ways?

For instance, the + symbol must be facing up while the - sign is facing down, and vice versa on the other side, in order to insert batteries into my remote.
gpt
This is usually because the batteries are placed in series to increase the output voltage. You’ll notice the + and - at the end of the remote are just joined with a small piece of metal. It’s the easiest (and therefore cheapest) way to get the voltage required.