1976 Evinrude 200 HP Outboards Service Manual, PN 5199, Page 138Get this manual
Specific gravity will vary points (.004) with every 10 temperature changeFor each 10 below 80 F, subtract points from hydrometer readingFor each 10 above 80 F, add pOints to hydrometer readingMter correcting to 80 F, interpret readings as follows: 1All cell readings uniform and above 1225 specific gravityBattery is serviceableMay require charging2All cell readings uniform and below 1225 specific graVityRecharge to full charge and retestSee note3Variation of more than 30 points (.030) specific gravity between any two cellsBattery condition is questionableRecharge and retest before making replacement perature reaches 125 F, or when gassing becomes excessiveFailure to do so may harm the batteryIf the battery is to be slow charged, adjust electro-