I have untethered Teison smart mini pro been 2 years of use so far so good ! Have type 2 to type 2 cable as well. It's convenient for public charging where there is no tethered connection available!
Yes, you should not rely solely on granny chargers, have a backup type 2 to type2 charging cable. This article explains granny chargers and their safety concerns hope its helpful for your decision making:)
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