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The lithium battery of the electric car is safe to be removed and charged, as long as you do not bump in the process, there will be no safety risk, at least better than the ventilation of the electric car. Easier to dissipate heat.
A long charge of a lithium battery may result in overcharge. Lithium batteries or chargers will automatically stop charging after the battery is full, and there is no so-called \"trickle\" charging of nickel chargers that lasts for more than 10 hours. That is to say, if the lithium battery is full, it is also empty on the charger. The characteristics of the battery's charge and discharge protection circuit cannot be guaranteed to never change and the quality is foolproof, so the battery will be hovering on the edge of danger for a long time.