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Is it possible to charge lithium-ion batteries without chargers? Is it possible to charge with a regular phone charger? And what happens if you charge one 18650 with a 12v power supply? A study was conducted that proved that a li-ion battery can be charged directly from a regular power supply. It was found out when and how it is possible to charge lithium-ion without protection. Under what conditions can a resistor be used as protection. Is it possible to charge a lithium-ion battery with a 12-volt power supply, and what is needed to charge it this way? Are charge controller boards needed at all? Are protection boards needed? Is it possible to do without a charger?