has anybody used or know anything good or bad about new batcap import and car audio battery? its made small enough to fit in factory honda space. thanks

The batcap is cool....but. Look into kinetik power cells..

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With Optima batteries, you have to get the reverse style D51 ao it will work for your car (or at least mine, 99 honda civic coupe. How does that work with bat cap. I've heard great things about them, but what about the actual fit. What series will fit my car (300,400,800 etc) ?