Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 190Get this manual
ELECTRICAL BATTERY RATINGS
plate is securely anchored within the battery case to ensure extended lifeThe caps of marine batteries are "spill proof" to prevent acid from spilling into the bilges when the boat heels to one side in tight turn, or is moving through rough waterBecause of these features, the marine battery will recover from low charge condition and give satisfactory service over much longer period of time than any type of automotive-type unit
Two ratings are used to classify batteries: one is a20-hour rating at 80F and the other is cold rating at OOFThis second figure indicates the cranking load capacitv and is referred to as the Peak Wa.tt Rating of batteryThis Peak Watt Rating (PWR) has been developed to measure the coldcranking ability of the batteryThe numerical rating is embossed on each battery case at the base and is determined by multiplying the maximum current by the maximum vol t-