So, the first thing really does sound like a battery issue.
I would get a new battery and see if this will fix it. Afterwards, try the micro SD card reader and see how it goes.
You already tried 2 known working Micro SD Cards.
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Did you formatted them, the right way? > [link|https://en-americas-support.nintendo.com/app/answers/detail/a_id/220/~/how-to-format-an-sd-card-or-microsd-card|How to Format an SD Card or microSD Card|new_window=true]
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Did you formatted them, the right way? > [link|https://en-americas-support.nintendo.com/app/answers/detail/a_id/220/~/how-to-format-an-sd-card-or-microsd-card|How to Format an SD Card or microSD Card|new_window=true] (Nintendo support).
If yes, then you can try to replace that one and see how it goes.
Hi!
So, the first thing really does sound like a battery issue.
I would get a new battery and see if this will fix it. Afterwards, try the micro SD card reader and see how it goes.
You already tried 2 known working Micro SD Cards.
Did you formatted them, the right way? > [link|https://en-americas-support.nintendo.com/app/answers/detail/a_id/220/~/how-to-format-an-sd-card-or-microsd-card|How to Format an SD Card or microSD Card|new_window=true]
If yes, then you can try to replace that one and see how it goes.
Try a new battery first and see how that goes.