1971 Johnson 125HP outboards Service Manual, Page 86Get this manual
7-6 Variation of more than 30 points (.030) specific gravity between any two cellsBattery condition is questionableRecharge and retest before making replacementNote: Disconnect positive cable when charging batterycCapacity Test Satisfactory capacity tests can be made only when the battery electrolyte equals or exceeds 1.225 speCific gravity at 80FTerminal Voltage Test3
FLOAT MUST BE FREE
HYDROMETER TEST EYE ON LEVEL WITH LIQUID SURFACE
MAKE CORRECTION FOR TEMPERATURE