The cranking battery is a Blue Top Marine Dual purpose AGM 800 CCA. This battery has been complety dead about 3 times over the last 6 months but has always been recharged back. I have left a 10 amp charger on it over night just to make sure it is up. It will last about 1 1/2 days and then battery is about dead. won't crank, trim will not work locators will not work. During a day of fishing in the late afternoon when I start the the engine the locators will shut down telling me that the battery is low. Charge it up that night and it will run about 1 1/2 days. Need to find the problem. Even if the battery is getting old I still have a short. Thanks