Hi Boop, welcome to ECF. Getting a backup device is a great idea, and if you are enjoying sub0hm it might make sense to consider a removable battery device, possibly a two battery one. I hate USB charging, period, although I do have some mods that use it. I like the convenience of charging them separately and swapping them out.
Although, most of all, congratulations on switching to vaping, that is fantastic. Hope you enjoy your stay here.
Anna