Been there before and I feel your pain... I was at Lake Bennett and the boat ramp there is at one end of the lake. It was in the high 30's that day and the wind was around 25-30 mph. we let the wind blow us down the lake all the way to the very back. Finally we decided to head back to the ramp and guess what??? Dead battery > We had a paddle, but it was useless trying to go into the wind. There was no one else there fishing to help either. We ended up paddleing to shore, and had to pull the boat with a rope all the way back to the boat ramp. Cold, wet and tired, we limped back home. Next trip we had 2 new batteries, and I have always taken a spare battery since.