2008 Polaris Ranger RZR Service Manual, Page 299Get this manual
ELECTRICAL 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 charts 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 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 YuMicronTM Type 1.275 1.225 1.175 1.135 less than 1.115