Заряд литий-ионного аккумулятора без контроллера заряда, без защиты обычным блоком питания 12 вольт

Is it possible to charge lithium-ion batteries without chargers? Can they be charged with a regular phone charger? What happens if you charge a single 18650 battery with a 12V power supply? A study was conducted that proved that a lithium-ion battery can be charged directly from a regular power supply. It also determined when and how lithium-ion batteries can be charged without protection. Under what conditions can a resistor be used for protection? Can a lithium-ion battery be charged with a 12V power supply, and what is required for this type of charging? Are charge controller boards even necessary? Are protection boards necessary? Is it possible to charge a battery without a charger?