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Nintendo's upgraded version of the Nintendo 3DS. It features bigger screens, longer battery life, better pixel density, and a better design.

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Middle part of 3DSXL battery connector looks oxidized

A friend of mine has asked me to help fix their second hand 3DSXL, because it was only booting when the charger was connected. When I looked inside there was just coke everywhere. When I took a look at the battery it was oxidized on the negative and middle part of the battery. I tested the battery itself and it was was fine.

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I tried putting my 2DS battery in (pushing it against the connector) and it still wouldn't boot. I've heard that the middle part is to prevent overheating. I then decided to take the 3DSXL apart further and I discovered that one of the middle connectors isn't reflecting like the rest. Here's an example of the 3DSXL connectors vs my NSMB2 2DS:

3DSXL (left of the middle)

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2DS

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Is there a way to remove the oxidization without making to much of a mess on the motherboard or could it be an entirely different issue?

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Yes you have oxidation on the pins of the battery, but luckily it does not seem too bad some white vinegar on a Q-tip and a old toothbrush should be able to remove a good amount. It is not possible to know if the oxidized battery caused damage further on the mother-board.

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