LiPo batteries of the same capacity actually have the potential to be much more dangerous than the sodium cell shown here.

LiPo packs typically use flat, soft walled cells which are far more susceptible to being punctured. In the event of a puncture or overcharge event, high temperature enduring flames are produced, with the severity and duration largely depending on the amount of energy within the cell. LiPo batteries also degrade at a much faster rate (both over time and with charge cycles) and have been known to spontaneously combust in storage while at rest.

With the sodium battery, the thrust produced by the puncture could have been easily been overcome by properly securing the cell.