Jump Box

Thanks Charrlie, your other post is what reminded me.
Have you used it much? Is amperage the number I'm looking for? I see some for $150-$200. I don't want to buy junk, but I don't need something a shop would have.
I have a 2011 Ford fusion, 4 cyl. It sets for quite awhile, at times, so the battery goes dead from the electronics. I got it for that. I did try it on several v-8's, plus my slant six racecar with about 10-1 CR. worked fine, and so far it holds it's charge for a long time in the trunk. That's why I got the second one. I paid around $60-$70 if I remember correctly.
PS: If you use it, you can recharge it from the cigar lighter, as you are driving.
PPS: The first one I bought came with a plugin (110v) charger. The second one didn't. You need a USB type plug in charger for house charging.