I'm not a Costco fan because it's 45 minutes away. But here in Canada I only see one maintainer there,
Shell SBC400 4 Amp Battery Charger and Maintainer Price $59.99 CAD
That's more than twice the price of my MOTOPOWER MP00205A 12V 800mA from Amazon.
In my opinion, a maintainer is not a charger and vice versa. I have a couple of 15 amp chargers with engine start and three maintainers with outputs ratings from 800mA to 1.5A. You don't need anything more to maintain a battery. And a 4A maintainer will take hours, if ever, to charge a dead battery. Spend $40 to $100 on at least a 10A proper battery charger.
Shell SBC400 4 Amp Battery Charger and Maintainer Price $59.99 CAD
That's more than twice the price of my MOTOPOWER MP00205A 12V 800mA from Amazon.
In my opinion, a maintainer is not a charger and vice versa. I have a couple of 15 amp chargers with engine start and three maintainers with outputs ratings from 800mA to 1.5A. You don't need anything more to maintain a battery. And a 4A maintainer will take hours, if ever, to charge a dead battery. Spend $40 to $100 on at least a 10A proper battery charger.