Jumping dead battery

There is a 12 volt battery in them for starting. However it isn't a very large battery and isn't usable to jump start another car directly.
I have been told that you could use the Prius to charge the dead battery by connecting the batteries with cables then letting the Prius run in ready mode for 5-10 minutes. Then disconnect the cars and try to start the dead car. Just be aware that if you make a mistake with the polarity it will cost in the thousands to repair the Prius electronics. I have never tried the above and doubt it's in the owners manual either.

Here is a video that will help you:

https://youtu.be/a9Ycibu9cwY

Please run down this guide and report back.