Battery Panasonic or Energizer

My MY2007 S2000 also came with Panasonic battery. I replaced it with Walmart battery in last summer (2015), So it ran for 8 years.

Original factory Panasonic battery in my RX-8 lasted 7 years. The 'premium' Exide I replaced it with is on it's way out now after only 4 years.

When I bought my 2006 4Runner V8 three weeks ago, it had the original Panasonic battery on it's last leg and I had it replaced with a Toyota True Start battery. The 4Runner only had 109,600 miles when we had that battery replaced.

my only option for a "proper" battery was a red top at $150.00. The next best thing was a group 47 Energizer, 590 CCA, 3 year full replacement, 7 year warranty from Sams Club for $65.00. I just dropped a load on the clutch and I don't plan on keeping the car for more than another 3 years. I only use synthetic oil so it cranks easier in the winter anyway. SO I got the energizer.