1998 Johnson Evinrude "EC" Accessories Service Manual, P/N 520213, Page 60Get this manual
After correcting to 80 (2]0 C)' interpret readings as follows: All cell readings uniform and above 1.225 specific gravity indicates battery is serviceable, but may require charging All cell readings uniform and below 1.225 specific gravity, charge fully and retest Variation of more than 30 points (0.030) specific gravity between any two cells, indicates battery condition is questionable Recharge and retest before replacing batteryCapacity Test Satisfactory capacity tests can be made only when the battery electrolyte equals or exceeds 1.225 specific gravity at 80 F (2]0
W Terminal Voltage Test 11 Use extreme caution during
any load testingImproper procedures could overheat battery and cause electrolyte gassingYou might create an explosive atmosphere1Variable Load High Rate Discharge Tester (Recommended) Connect tester to battery terminal postsDischarge at rate of three times battery ampere hour rating for 15 secondsIf the voltage is 9.6 volts or higher at the end of 15 seconds, the battery has good output capacity2Fixed Resistance Tester This equipment has built-in load for high-rate discharge testingFollow equipment manufacturer's instructions regarding test period and meter readings3Engine Load for Resistance Disconnect charge coil connectors between stator and power packConnect voltmeter across the batteryCrank engine for 15 secondsIf voltage is 9.6 volts or higher at the end of 15 seconds, the battery has good output capacity12009