Unlike a combustion engine vehicle, electric cars are able to handle long periods of inactivity quite well. If you are concerned, you could leave the charging cable connected, since it only draws power until the battery is fully charged and then stops. Thus, if your battery were to lose any charge, it would be topped up without running an exorbitant bill. However, experts recommend you do not leave a fully charged EV standing idle. Leaving your battery at around half capacity is ideal if you intend to leave your vehicle parked for an extended period. Just be sure to park in a shaded spot, since excessive heat can have a detrimental effect on battery life.