2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 210Get this manual
ELECTRICAL 34Set battery aside to allow for acid absorption and stabilization for 30 minutesAdd electrolyte to bring level back to upper level mark on case
OCVOpen Circuit Voltage Test
Battery voltage should be checked with digital multitesterReadings of 12.6 volts or less require further battery testing and chargingSee the following chart and Load TestNOTE: Lead-acid batteries should be kept at or near full charge as possibleElectrolyte level should be kept between the low and full marksIf the battery is stored or used in partially charged condition, or with low electrolyte levels, hard crystal sulfation will form on the plates, reducing the efficiency and service life of the batteryOPEN CIRCUIT VOLTAGE State of Charge 100 Charged 75 Charged 50 Charged 25 Charged Charged Conventional Lead-Acid 12.60 12.40 12.10 11.90 less than 11.80 YuMicronTM Type 12.70 12.50 12.20 12.0 less than 11.9 V
NOTE: This is the last time that electrolyte should be addedIf the level becomes low after this point, add only distilled water5Charge battery at 110 of its amphour ratingExamples: 1 10 of amp battery.9 amp; 110 of 14 amp battery1.4 amp; 110 of 18 amp battery1.8 amp (recommended charging rates)Check specific gravity of each cell with hydrometer to assure each has reading of 1.270 or higherBattery Inspection