2005 Polaris Sportsman 400/500 Service Manual, Page 289Get this manual
ELECTRICAL voltage while cranking the engineContinue the test for 15 secondsDuring cranking the observed voltage should not drop below 9.5 voltsIf the beginning voltage is 12.6 volts or higher and the cranking voltage drops below 9.5 volts during the test, replace the battery
CONVENTIONAL BATTERY CHARGING PROCEDURE
1Remove the battery from the ATV to prevent damage from leaking or spilled acid during charging2Charge the battery with charging output no larger than 110 of the battery's amphr ratingCharge as needed to raise the specific gravity to 1.270 or greater3Install battery in vehicle with positive terminal toward the frontCoat threads of battery bolt with corrosion resistant dielectric greaseDielectric Grease (PN 2871329) 4Connect battery cablesWARNING