system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is it when you’re using something that uses two batteries and it starts to go dead you can switch the same batteries in different slots and I’ll give your electronics more battery life?

It’ll*
gpt
Two reasons:  

1. Removing and reinserting the batteries cleans some oxidation off the contacts, improving the connection.  

2. Handling the batteries heat them slightly. Household  batteries rely on chemical reactions that work slightly better at higher temperatures.   

Switching doesn't do anything by itself.