I’ve known those Luna guys for years (well before the store came out), and this bit of info looks to have come from the days when LiPo was popular (see post #4). Sane people only charge those in grills.

I designed a LiPo system but never bought it because I didn’t want to charge in a BBQ grill. People used to tell me to use LiPo back in the day, but I’m certainly not going to charge a dangerous pack at work!

The Panasonic 18650 type cells are much safer. And well, you read the papers. The news last weekend was a 3 year old who died because someone charged their lithium batteries in a hoverboard at home. Still, a name brand cell like this is “reasonably” safe. Charge it over concrete if you can. Smoke detector would be a good idea too, for your charging area. Be aware. If it is damaged, be careful.