John, FWW. Learned about these from one of our sons. Found a Caterpillar (CAT), at Costco. Has a small LED light, 4 USB outlets, a 200 watt 120 volt outlet, short jumper cables, a tire inflator, and a detachable charging cord. Rated at 1000 cold crank amps. Decent carry handle. Newer version has been stepped up to 1200 CCA. The only thing I would have wanted was 12 volt outlet. However, that wasn't a deal killer. I have two flashlights, and a mini tripod LED light for emergencies, probably overkill. I can recall a number of times I was stuck with a dead battery in my younger days. One of these would have been handy.
I would advise taking the operating instructions quick start sheet and put it in a zip lock bag. Attach to carry handle or cables just in case someone needs. Also they say the battery is sealed. Yeah, right, where have we heard that before, I took a short length of thin rope and tied to something rigid in the truck and car, so that it will not tip over. Also, took some Velcro power cord wrap and attached charging cable to handle, just to keep track of it.
Almost forgot. Personally I'd advise against one of those inexpensive, mini jump starters. Not enough guts there for cold weather, or if you need a second use , or if you forget the maintenance charge. How do I know, my buddy has one. His has a van with high mileage and some sort of a battery charging system disorder (nightmare). They have used it many times. However, they have had some let downs when it happens a second time before they can get home and recharge.