I really wish a significant fraction of consumer electronics ran on removable rechargeable cells of standardized form factors. There are only bad reasons most Bluetooth speakers (to give an arbitrary example) don't run on a removable 18650 cell.
When companies do use that approach, they usually include a warning insert about not shorting, mechanically abusing, or eating the battery. Li-ion cells aren't very difficult to handle safely, especially in single-cell applications. This has gone well for flashlights, but has yet to be widely adopted in other product categories.
I understand that major consumer-product companies are reluctant to offer a product with any risk of attracting personal injury lawsuits, but I'm still classing it as a bad reason.
Standardized Li-On battery could be safe. IMO it's now available as "Portable Power Banks", but its form is not standardized.
Simple 18650 cell can't be safe. Normal consumer may just put/charge raw 18650 cell, then burn.
It seems that no one intend to make standard Li-On battery. Some manufacturers just use other brand's battery. (e.g. Blackmagic products uses Canon's battery)
