you didn't get trade in but a prorated charge from your old battery. i put in a Wal Mart battery in my 6- cly for $30 and it has same warranty and all amps rating (coldcranking, etc.) as Motorcraft that was priced at $75. can't back away from that although i hate way Wal Mart bulls its way into little towns and drives all little businesses out. you can't beat their prices on item for item comparison. have had my battery here in Buffalo, NY for 3 years and start my car up every 3 weeks with no problelm. 3 or 4 years ago a VMFer had a consumers report giving them a favorable rating although i don't respect their ratings that much. back in '73 they said my Dodge Dart 340 was worst rated car in its class and my '73 Fiat (worst car i ever owned) was best in its class. two years later for used cars it wass reversed.