I have kept a jump starter, an air compressor, and an electric jack in every vehicle we have owned for 20 years and have used all three on numerous occasions for our cars and for others as well. The latest versions of jump starters are about the size of a smartphone and work great. Ours also include cellphone chargers and a flashlight. The cordless air pumps also have a flashlight and adapters for inflating balls and air mattresses, boats, etc. which have proven to be handy. I put a scissor jack and a tire repair kit, along with the mini jump starter and compressor into my frunk and augmented my tool kit by including tire plugs and an electrical repair kit. Both the jump starter and compressor work well, but the compressor is considerably slower than a good, corded compressor. But it is easier to use. I get most of my tools on eBay very reasonably after a good long patient search (Jump starter and compressor combo $25 US). I intend to get a mini cordless impact wrench eventually to replace the lug nut wrench and jack crank. I believe it's better to have and not need, than it is to need and not have. I think you made a wise decision. You may not need it for yourself, but you will probably use it for someone somewhere sometime. In the 60s and 70s I usually carried spare bulbs, points, and plugs on my bikes. And in my cars, I usually carried spare starters, alternators, points, and fuel pumps. I had a couple of Chrysler products that often needed those replaced (a 340 Duster and two 440 Dodge Chargers). I once had to connect my windshield washer with gasoline in it to the carburetor to get into town to a parts store (don't do this at home without adult supervision). I twice had to leave my car on the side of the freeway, only to find them stripped when I got back to them with repair parts. This was before cellphones. Now days, I usually carry a gun with me outside town as well (Better safe than sorry). An old man on oxygen stranded on the side of the road is a tempting target for far too many these days. Vast areas in the west outside of population centers don't have cell coverage. And probably never will. Sincerely William