That batteryminder 1500 warranty is through the factory. To register a warranty, you just sign up through VDC electronics' website and it's a 5 year warranty. They're pretty lax on their standards for warranting their chargers.
All warranties are through the factory.
But it's a crap-ton more convenient to go through a reputable business and just exchange it immediately with no effort than to go through the hassle of dealing with:
1) Registering the product online (and getting put on mailing lists and phone lists).
2) Phoning the company to get an RMA.
3) Paying for shipping back to the company.
4) Waiting a week or two while the company decides whether or not the failure is warrantable.
5) Waiting another week or two for the company to ship a replacement.
If the OP buys through a store he will be able to avoid the cost and time waste if something's wrong or a piece is missing from the package. Hell, even Amazon will at least give you a
free shipping label if you need to return a defective item as opposed to your situation where the OP would have to pay for shipping.
eBay is great for finding discontinued things that are difficult or impossible to find in stores. It's not, however, a good substitute for a reputable business with convenient return policies.
Batteryminder 1500 is a better value, that's old style crap.
The BatteryTender Plus (which is what is in jagec's link) is temperature compensated and has
exactly the same features as the BatteryMinder 1500. The only difference is brand. I swear to god, it's like you're on commission from the BatteryMinder people.
And even the non-compensated regular "BatteryTender" (non-"Plus" models) are far from "crap." They easily double the expected life of motorcycle batteries even without temp compensation. While adding temperature compensation on top of the basic float charging might get another 8 months or so on top of that, the vast majority of the benefit is captured with a simple float charger.
ZV