Can I come down and exchange a interstate battery that is less then a year old and still under warranty, without having a Costco card? That is if you have the deep cell interstate marine battery’s.

No you have to show membership card

If it was purchased from Costco and you're a member or if you go with a member then you don't necessarily need a card. Membership is only $60 a year ($5 a month) and the savings are well worth it in my opinion. Hope that helps.

Yeah you need a card. if you're a member without a card on you, they can look up your membership with an ID.

If you forgot your card they can look you up. If you don't have a card at all then you won't be able to exchange