When your tealight partially burned out, and you re-kindle the tealight later, it will go out fast again. Even if it burns a little while, then there is much unburnt fat behind. When solidification of the fat "crawls", and can't burn sufficiently. Therefore you throw often burnt candles away. You can avoid it this way: Insert the solidified candle again, and hold him immediately on his head. The flame is used to heat the fat. Thereby quickly turn the cup around its own axis, so that on every side of the pit the fat melts a bit. By the time the tray starts to be called, there is melted enough fat: a droplet is enough. Put the container then ate it, and it candles burns completely out now.