Costco sells the Michelin Portable Jump Starter for $84.99, with a 10,000 mAh LiFePO4 battery and a 4.5-star rating from 200+ reviews.
Not to be overly presumptuous, but there's a good chance that you've experienced a dead car battery before. If you haven't, lucky you — but for those who have, you already likely know what a hassle it can be. Waiting on a tow truck for a jump can be ... [2940 chars]