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What do you call the battery slot's ends? By that, I mean the spring and the little round flat end for the plus and minus ends of the battery. Do they have a name? I looked up on the Internet, but couldn't find anything.

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They are called contacts., or alternatively, terminals.

A battery holder is a cavity or compartment used to house one or more batteries in a piece of equipment safely. The battery holder has flat metal or spring coiled contacts that press against the battery terminals making an electrical contact.

Battery holders and mounts (RS Components)

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    I was going to suggest another word from your answer, which is terminals. I believe it can be used to refer to the contacts just as well as to the ends of the batteries. Commented Sep 17, 2019 at 12:28
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    My 2 cents: Terminals are the ends of the battery itself, while contacts are on the device. Using them interchangeably is acceptable, but less common in my experience.
    – Aaron
    Commented Sep 17, 2019 at 16:13
  • Using 'positive and negative terminals' of e.g. a battery, DC generator or motor is very common. Commented Sep 17, 2019 at 19:26

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