A bit of a long post here. Sorry but I'm in over my head here and need some knowledgeable advice (JMOR/Soundguy,others?). I have a 2015 Polaris 570 EFI Sportsman ATV. It's has 110 miles on it and the OEM battery (about 190CCA/12amh)went bad. They are known for this. This model has all kinds of issues with cranking and start up because of the large single cylinder motor and seemingly anemic OEM battery designed for it. After looking up some of the solutions other have come up with I installed a larger Duracell 325 CCA 19 Amp Hr AGM battery which solved the start up issues. I was informed that with the type of charging system on a Polaris (Stater 3 phase AC maximum output at high RPM's of 55 to 60, that flows to a combination 50 amp rated Rectifier/Regulator) That the charging system was only designed to keep up and not fully charge the battery like a alternator does. On the Polaris forum it was suggested that I might have installed too big a battery and that the system might constantly try to charge the battery and heat up and eventually fail and take out parts if not all of my electrical charging system depending if the rectifier failed in the open of closed position. I was told I need to know the Watts out of the stater and my batteries optimum charge rate ( I believe it's 2amp or less) to be sure about the battery size. Electrical theory and math is beyond my abilities. Thanks in advance.