Just installed an Optima D51R to replace my 450CCA Supercharge Gold. It's almost a perfect fit. Lights are brighter and it cranks heaps easier. When I upgraded to the Supercharge Gold before I almost couldn't tell the difference between that and the crappy stock battery. Asked the guy to test my old battery and apparently the CCAs dropped to 360 over 3 years. I have UR pulleys in my car too so hopefully a deep cycle battery will help.
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