ohh yah and I always have these in all of my cars. the biggest pro being: my battery wont die at random
I have never had one die when I needed power and even when my altinater went out I was still able to drive on the battery for more then 50 miles to get to the shop and the car was still going
if it does lose its charge you can recharge them 100's of times where a normal battery would need to be replaced after a few charges