This battery was in an old non-running Volvo I just picked up. A Valucraft from 2013 rated at 550 CCA. Autozones's low priced battery line similar to Walmart's $55 batteries today. It could have been sitting for months or more. Figured it good only for a core, but put it on a charger anyway. It tested out at under 100 CCA after a few attempts. Then I put it on a Battery Minder maintainer/reconditioner. After 24 hours it was over 200 CCA. After 2 days, over 300CCA. Currenty over 450 CCA. Good enough for me on a battery rated at 550CCA.