There have been a lot of posts about what happens if you are stuck with dead batteries. I am including this post as and INTERESTING ITEM and NOT as something I expect people to do.
http://makezine.com/2017/02/01/return-makeshift-challenge-dead-car-battery/ This link takes you to an online magazine that has resurrected a column by the guy that created MacGyver (I love MacGyver). Their first reposting is how to resurrect a dead car battery. I hope to never need to consider doing it but I am finding it an interested read and hope some of you do too. AND I may start carrying aspirin in the glovebox... just in case.
Enjoy!