This is the best rechargeable stereo system out there for tailgating. It's loud enough to annoy your neighbors and I think it holds a charge for 8-12 hrs. I bought mine 3 years ago for close to $300. They are now listed at Sams club for $149. I'm thinking about buying another so I can run them parallel to each other and it will be super loud. Just thought I'd share with eveybody.
The only downside is that lead-acid batteries don't last forever (like your automobile battery) but I was able to pick up a replacement battery and install directions off ebay for cheap. I got 3 years of tailgating out of the first battery so I'd say I got my moneys worth out of it.
You won't be disappointed in this product! Let me know what you think.