1970 Johnson 115 HP Outboard Motor Service manual, Page 86Get this manual
7-6 If cell readings are both above and below 1.95 volts and the difference between the highest and lowest reading is less than ,05 volt, the battery should be rully recharged for good performanceIf any cell reads 1.95 volts or more but there is difference of .05 volt or more between the highest and lowest cell, the battery should be replaced
If the reading for all cells is less than 1.95 volts, the battery is too low
Figure 7-2Light Load Test
to test properly; howeverthis does not necessarily indicate defective batteryA battery in this condition should be boost charged but not [ully harged at this time, and the "light load test" repeated using the to 10 ampere load during the test If the battery Is fOood to be good after boosting, it should be fully recharged before returning it to serviceIf none of the cells come up to