A common misconception is that all car batteries die. This, in fact, isn’t true—the majority of “dead” car batteries just don’t contain enough juice to power a car, but they can still provide enough watts to keep emergency fans and lighting running,
which is great when a power outage occurs. So, instead of lugging the battery to the nearest drop-off center or just letting it collect dust in the garage, you can put that car battery to good use. check out this article below to see what you can do with your old batteries.