I have a variety of large AGM (gel) batteries taken out of ups and telecomm back-up systems, priced from $65 to $125. I'm told that these would be great for car audio systems and competition. All are in great condition, and are tested for load, voltage, and continuity. These range from one to four years old with a ten year design life in ups service. Weights are between 75 to 100 lbs. each.12 volt, 100 AH to 150 AH. We can ship in quantities of 1000 lbs or more. Give me a call and we'll talk! Jeff 254-228-6503 firstname.lastname@example.org Located in Dallas.