The original OEM Panasonic was replaced 4 years ago with another OEM battery by Honda (covered under warranty). This second battery has been getting sluggish lately. I put it on a charger this week, but this morning, she wouldn't start. So I took out the anemic OEM 51R battery (400 CCA's) on my lunch break and purchased a bigger (24F) East Penn/Deka battery (Napa Legend Premium....725 CCA's). I only buy East Penn batteries. This thing comes with a 7 year warranty. I'll install it later tonight when I get home from work.