I have a 1979 Ford F100 I bought new. As soon as I had to replace the battery, I acquired a CAT battery out of a Caterpillar. It was just the right size for the battery storage slot. I NEVER had any issues with power. I finally had to replace it after about 15-18 years. Not because of it being worn out,, the post broke and when I went to replace the post, I broke the battery post and I was afraid of the acid spilling out. I could jump start cars, power many, many lights and everything else. I guess that was a deep cycle battery and I could never get it low enough to need a charge. Best thing I ever did! I have a new battery in it now, but I have a battery tender on it to keep it charged in the garage.