Electronic candle

An electronic candle, comprising:

• a shell including a through-hole positioned on a top surface of the shell;
• a light-emitting assembly including a flame sheet configured to protrude through the through-hole of the shell;
• a self-locking device comprising a switch and a spring, wherein the self-locking device is configured to operate in (1) a locked state when the switch locks the spring in a compressed state and (2) an unlocked state when the switch releases the spring to be in a relaxed state;
• and
• a bottom case connected to the self-locking device such that the bottom case is enclosed within the shell when the self-locking device is in the locked state and the bottom case is exposed beneath the shell when the self-locking device is in the unlocked state,
• wherein the bottom case comprises an interface assembly that includes a connection port configured to be hidden within the shell when the self-locking device is in the locked state, and
• wherein the bottom case includes a power cord configured to be wound fully or partially in the shell.