>There are batteries special enough that I can't pick one up at Walmart You can't pick up a standard 18650 battery at Walmart either, but that doesn't make it

>There are batteries special enough that I can't pick one up at Walmart You can't pick up a standard 18650 battery at Walmart either, but that doesn't make it some kind of special battery. It's bog-standard. Availability at Walmart has nothing to do with something is standard or even common. Brake pads for some random mass-market 2015 model year car (GM, Toyota, etc.) are nothing special or difficult to find either, but you're not going to find them at Walmart.