Ron The smaller garden tractor battery (EverStart @ Walmart) seems to do the trick and cuts down on weight. I dont anticipate the battery being a problem. It should run about 2 days on that setup without a charge. As long as I can get near an outlet each evening it shouldnt be a problem. The CD deck I am running has a built in 160 watt amp. I got a good deal on the CD deck otherwise I would be running an external amp. The setup as it is now is plenty loud with the built in amp and 40 watts speakers. Snowgoosegear About how much are you putting into mp3 setups? The only thing keeping me from going with the mp3 + walkman CD + car amp type arrangement this year was cost. I picked up my wireless CD deck for $48 so it was a hard deal to pass up. On the cheap side when I looked at the mp3 rig it was about $50 for an adequate mp3 player, about $70 for an amp to push 4 - 50 watt speakers and about $30-40 for a portable CD player. Does that sound about right or did I miss something. Thanks!!