1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 269Get this manual
Battery Cable Extensions The following are minimum specifications for stranded copper cable without splicesCable measurements given are from the motor to the batteryThe maximum length is 20 ft(6,1 m), regardless of cable diameterThese specifications do not apply to aluminum battery cablesOMC does not recommend the use of aluminum battery cablesMinimum Recommended Gauge
Total Extended Length Model 205010 ft(0,3m) gao 1115 ft(3,44,6 m) gao 1620 ft(4,96,1 m) gao
PCE0061
Battery Specifications
All batteries should be of heavy duty, marine construction and vented, refillable typeMaintenance-free or sealed batteries are acceptable for use ONLY with engines that are equipped with fully regulated charging systemRefer to Specifications, Section 1Note batteries must not be used as the engine's cranking battery