On my Porsche I run an Optima which lasts 7+ years and is a very strong battery.
I like them and that's what I use in my Toyota (Lexus). Had it a couple of years and so far so good. One neat thing about the Optimas is that since it's 100% sealed there's no worry about tipping it or having to wear gloves during transport and installation. It's also lighter.
I've got a '13 R with KESSY and NAV. that had a weird slow start, which made me think the KESSY swt. was worn like another thread mentioned. So I tore it apart and it was dirty on the contacts so I cleaned them. After that it seemed better but the car had 30+K miles and I did get another weird slow start, so I tested the battery and it tested good/charge. I did end up replacing the battery. I haven't had any issues since then. Now at 52K miles.
With your help, I just replaced my 9 year, still well functioning battery, in violation of the "if ain't broke..." rule. The process went without a hitch, thanks to your great information.
Get an Optima battery and the battery minder - it's just a trickle charger that slow charges the battery to a certain voltage and then turns itself off. That's what I use in my S2000.
Agreed with others, weigh your usage and environment/climate into the equation. We will personally be replacing ours with a deep discharge battery like the Optima Yellow, since I've noticed that of recent we've been running a lot quick errands that involve one person running in while everyone else hangs out in the car with A/C on.
I run an oem vw battery was surprisingly cheaper than any aftermarket local options for me.
Anyway, I bought a new battery and everything was fine for several months. Yesterday my car did not start again. I put a charger on the battery and it started this morning. However, this afternoon it would not start again. I charged it again and went and had the charging system and battery checked out (all good).
Optima batteries have taken a hit in quality in recent years.
Optima batteries have been objectively awful for years. Don't buy them.
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