I didn't have it full throttle the whole time but a good chunk of it I did. The only difference I can think of that caused such a fast drain was a false fully charged reading, or, being depleted because of having 4 people in the boat (usually I have 2). Next time though I'll lay off the throttle and save some juice. Boy I look forward to the day I have a bigger boat and gas and electric engines!
Linear Mode
