Aukey Jump Starter | $35 | Amazon | Promo code AUKEYBC1

This portable jump starter from Aukey isn’t the most powerful out there, but at 400A peak output, it should be able to start most cars (with 5L engines or smaller) as long as their batteries aren’t that dead. Plus, at $35, it’s one of the most affordable options we’ve seen. And of course, it can also recharge your phone.