1994 Johnson/Evinrude Electric outboards Service Manual, Page 20Get this manual
bFixed Resistance Tester This equipment has built-in load for high-rate discharge testingFollow equipment manufacturer's instructions regarding test period and meter readingscEngine Load for Resistance Twist the spark plug leads and remove them from the spark plugsConnect voltmeter across the batteryCrank the engine for 15 secondsIf voltage is 9.6 volts or higher at the end of 15 seconds, the battery has good output capacityBattery Charging &