In the past times the main thing that went in a cigarette lighter was a cigarette lighter, now'er day individuals have a wide range of thing which they can undoubtedly neglect to unplug which could deplete the battery. 
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 https://www.letsdiskuss.com/assets/upl_files/9df1c869c5.jpg" style="width: 50%;"> <br></div><div><br></div><div>I had a client once who's vehicle battery had gone level on their Rolls Royce, Silver Shadow. It required a long time to discover what was causing the channel. It ended up being a golf ball, stuck between the switches for the front power seats and the cigarette lighter, keeping it squeezed in. I don't recall 'charging' him for the work.</div>

Why don’t the cigarette lighters-12V power sockets in newer cars have constant power like they did in older cars?