To clarify...
Yellow Top:
Like someone pointed out these are deep cycle. They withstand constant draining and charging. Good to power heavy sound systems.
Red Top:
These are good starter batteries as they are generally rated with higher CCA or cold cranking amps. Not good for constant drain/charge.
User Reviews:
Many people report bad experiences with Optima batteries over the last few years. Prices have gone up. Customer service seems to have gone down.
My experience:
I have two batteries in my engine bay, one to the starter -- I got the red top. I had to return it, as it was defective from new. Paid $260 (2 years ago). The replacement seems to be holding well. I wish I didn't choose the Optima.
The other battery in my engine bay is the Kinetic High Current power cell (also a dry cell battery).
Now Kinetic batteries have nothing but good reviews. I wish both of my batteries were this brand. It comes in several shapes/sizes and power ratings and will mount in any position (upside down etc..) and they are good deep cycle batteries and last long, according to user reviews. They also have low internal resistance, like the capacitors used in sound systems, among other great features.
I have the KHC1800 in my car. It's about the same size as the stock battery.
http://www.kinetikaudio.com/2009/produc ... &P=KHC1800
I'd say check them out... although I found the local prices kinda high.
Yellow Top:
Like someone pointed out these are deep cycle. They withstand constant draining and charging. Good to power heavy sound systems.
Red Top:
These are good starter batteries as they are generally rated with higher CCA or cold cranking amps. Not good for constant drain/charge.
User Reviews:
Many people report bad experiences with Optima batteries over the last few years. Prices have gone up. Customer service seems to have gone down.
My experience:
I have two batteries in my engine bay, one to the starter -- I got the red top. I had to return it, as it was defective from new. Paid $260 (2 years ago). The replacement seems to be holding well. I wish I didn't choose the Optima.
The other battery in my engine bay is the Kinetic High Current power cell (also a dry cell battery).
Now Kinetic batteries have nothing but good reviews. I wish both of my batteries were this brand. It comes in several shapes/sizes and power ratings and will mount in any position (upside down etc..) and they are good deep cycle batteries and last long, according to user reviews. They also have low internal resistance, like the capacitors used in sound systems, among other great features.
I have the KHC1800 in my car. It's about the same size as the stock battery.
http://www.kinetikaudio.com/2009/produc ... &P=KHC1800
I'd say check them out... although I found the local prices kinda high.