I haven't stress tested it but I have a Spotfinder in my small wallet.
Atuvos one at 1.6mm and UGreen one at 1.7mm are great, though one time battery is annoying. There are some that have wireless charging, though thicker.
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Atuvos one at 1.6mm and UGreen one at 1.7mm are great, though one time battery is annoying. There are some that have wireless charging, though thicker.