 The other good thing is if you're restoring a car, because they're a sealed unit, they're not going to leak and damage whatever it is that you spent all that time restoring. And they hold up a lot better than that because you're able to have the vehicle sitting for longer periods of time without the battery draining. Now, of course, still it's a good idea to put a battery maintainer on the vehicle because that will make the battery last even longer than it would have before. Because no matter what.