Why not a computer USB ?And not using a computer usb...
SMY TC MiniWhat mod is it?
Computer and Laptop usb is usually always greater than 4.2 volts, so overcharge.
The charge board may get to hot if it has to charge a battery at the same time as it is allowing you to vape and it may fail . Some Mods have the charge board hotglue in place and the glue may melt .I have a small mod that I like to use at work that allows you to vape while the batteries are charging. If I leave the mod on the charger the majority of the time to keep my battery full charged, am I hurting my battery or my Mod?
Just to clarify, on-board charging and pass through are not necessarily the same thing. Any pass through is obviously on board charging, but not every mod with on board charging is a pass through. Pass through simply means you can vape while charging. Just fwiw @pescadore