You might think these things are just pieces of junk in your garage, but if you learn how to revive dead batteries, you can actually use them again! The only reason you’re not using a dead car battery is due to its inability to provide the amperage to start a car . Still, even if
Regenerating sealed lead acid batteries By design sealed lead acid batteries are, by their very nature, sealed. This means that if they have been damaged by ovecharging and have dried out then it is problematic to restore them. Ironically it is possible to do this damage in the first place because they aren’t completely sealed.