The Swiss Army Knife of Batteries
When the zombies come, and face it, it's just a matter of time, there are certain things you're definitely going to need: records to throw at them, shotguns for shooting, working cell phones and laptops for communicating, and of course, a reliable vehicle. You're on your own for records and shotguns, but arriving in just a few weeks to keep the last two going, the Cobra JumPack is kinda the Swiss army knife of battery packs. It's a helpful tool from the company best known for state of the art radar detectors.
It's got a 7500mAh Li-Cobalt battery, which is basically fancy speak for "this is way too powerful to only be a flashlight-slash-USB charger for your phone and computer." Yeah, if you want you can hook it up to an inverter and run some things off of it while you're camping, but that doesn't help you with the zombies.
These jumper cables will, though. They'll get your car started with almost as many amps as your car's own battery. It'll stay charged for up to six months before you need to recharge it, too, so you don't have to always worry about it. And should the zombie apocalypse happen sooner than that, you can always jumpstart the hell out of 'em, Archer-style.