I have one I bought probably 10 years ago. Replaced the lead acid battery in it about 4 years ago. Good as new again. I use it all the time. I use it sometimes to start a cub by adding a small positive lead for the coil, then touching the positive clamp to the starter terminal (with the negative clamp on the frame.) will run the tractor before any other electrics have been hooked up. I used to take it with me in my runabout in case my battery died while fishing. Can't count the number of times I've started a car or tractor with it. It's not fancy, just the short cables and a 12v. cigarette lighter plug. Come to think of it, I've used that plug as well to power stuff, too.
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