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I've had/have a couple that use an 18ah SLA battery, and they will make up the difference if your battery is a bit too weak to crank over. Completely dead? Probably not, though I have hooked one directly to a starter on an engine that's out of the car and cranked it over just fine, as long as the battery pack was fully charged.
I had one with a smaller, 7ah battery in it. It could help, but wasn't really enough to make a big difference.
I h ave one of those mini lithium ones. I haven't had to use it yet, so couldn't attest to how useful they are. It only has 10-gauge wires on it, so I don't expect it'll put out more than 50 or 100 amps, whatever it might actually be rated at (400?).
Again, the big, heavy SLA ones (~18ah) work fine on 4 bangers, or even 6s.
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