I run a 60" plow, heater, radio, windshield wiper, 36" light bar. My battery tender I purchased right after getting my 700-4 would charge it up, but then once battery went low again it would not charge up stock battery. I took my unit over to a friend that works on Polaris units but owns two Honda ATV's said I should invest in a better battery plus a better tender. He said when I'm not using my unit I should always have it on a tender which will result in longer battery life like years not one or two years. No problem so far.