Recently ordered a new battery for my jump box that I keep with stand by generator in case of battery failure of built in battery. Searching around, I found the Might Max battery I needed to be priced at $39.99 almost every where. But when I go to Amazon, they want $42.99 for same battery. Scrolling down the page, I see same battery, also from Amazon, for $39.99, which is how I ordered it. FYI, last week I replaced battery in jump box I keep in van. It was a Mighty Max battery that was a little over five years old, so it didn't owe me anything. The one I'm replacing now is the OEM battery that came to me as a used jump box, about five years ago. Rescued it at the dumpsters, pried the caps off, and added distilled water. It still cranked service generator yesterday, but very slowly, so I knew it was time for a new battery.