Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 50Get this manual
INSP ADJ
GENERAL
E NOTE: Batteries vary among manufacturersTherefore, the following procedures may not always applyConsult your battery manufacturer's instructions First, disconnect the negative lead, then the positive leadInspect: Electrolyte level Below the minimum level mark Add distilled water to the proper level Electrolyte specific gravity Less than specification Recharge the batteryElectrolyte specific gravity 1.280 at 20C (68F)