2005 Polaris Sportsman 400/500 Service Manual, Page 284Get this manual
ELECTRICAL Battery Check:
1Check the date label on the side of the battery to calculate when to check voltageThe battery should be checked every months2Check the voltage with voltmeter or multimeterA fully charged batter should be 12.8 or higher3If the voltage is below 12.8 V, the battery will need to be recharged2Test battery with voltage meter or load tester to determine battery conditionThis will determine the length of time required to charge the battery to full capacityRefer to capacity table3Charge battery using variable rate charger
SEALED LOW MAINTENANCE BATTERY CHARGING