Spoiler, it works. I use a lithium booster battery pack for an old car I use, and have used the battery pack to jump-start my car multiple times on a freezing-

Spoiler, it works. I use a lithium booster battery pack for an old car I use, and have used the battery pack to jump-start my car multiple times on a freezing-cold day (sub 10f) while trying to locate a store with a new car-battery in stock.