ESR for MagSafe Sticker 360, MagSafe Ring, 2 Pack Magnetic Ring, Universal Magnetic Wireless Charger Conversion Kit for iPhone 17/16/16e/15/14/13/12/11, Samsung Galaxy, Google Pixel 10, Black

I use this on my S2: Magsafe Battery You'll either need to get a magsafe ring on Amazon that sticks to the switch/case on the back: Magsafe Ring That way you can buy literally any case that has a flat back that you like, stick the ring to it, and use the battery bank that way. This will make the Switch significantly heavier though, that battery is pretty hefty.

https://www.amazon.com/dp/B09BZ17JM7

Yes! It is still holding strong. At no point did I even worry or think about it coming off. The only thing worth adding is - if you're a pet owner, because of the texture of the phone - pet hair appears to easily get stuck along the outer edge of the ring. Despite this, I'm still very much so not worried about the ring coming off. I hope this helps! Edit: Including link to my exact ESR ring. https://a.co/d/0fUIqYNc