There are 2 rules when it comes to cells and
vaping.
1: Always use genuine cells which are overrated, as the extra headroom makes for better safety.
2: Use a decent external charger as you cannot necessarily rely on the charging circuit of a
mod or its implementation, unless you're willing to pay a lot more money for a mod with a reliable charging circuit and that isn't an option for some.
But I don't know why there's mention of using the charging cable? Unless that's an oversight and they missed out that it is to do with internal battery mods.
But the more I read this over the more I see, perhaps the battery or cell is the truth? And if so, they didn't mention that they had it stowed well in a suitable battery carrier.
And all we can see from a photo, be it stock or not. Is just the main can part of the cell, which looks remarkably clean if it was in a mod?