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A red top is a replacement for a standard battery, a yellow top is a deep cycle storage battery, and a blue top is a marine grade deep cycle storage battery.
Also, know that deep cycle batteries generally have a slower response time to current demands. So if you replace your battery with a deep cycle battery, your dimming could actually get slightly worse.
I also run a redtop as my main battery.... its my third one in about 6 months due to the first two having bad cells, but it was covered under warrenty. Great battery otherwise!