2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 412Get this manual
ELECTRICAL Conventional Battery OCVOpen Circuit Voltage Test
Battery voltage should be checked with digital multitesterReadings of 12.6 volts or less require further battery testing and chargingSee charts and Load Test belowNOTE: 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 battery
OPEN CIRCUIT VOLTAGE
STATE OF CHARGE 25 Charged Charged CONVENTIONAL LEAD ACID less than 11.80V -LOW MAINTENANCE Less than 11.90V
SPECIFIC GRAVITY
STATE OF CHARGE 100 Charged 75 Charged 50 Charged 25 Charged Charged CONVENTIONAL LEAD ACID 1.265 1.210 1.160 1.120 less than 1.100 -LOW MAINTENANCE 1.275 1.225 1.175 1.135 Less than 1.115