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Portability wins though. The early powerall ones seemed to be among the most reliable, I tend to use mine only when other people need a jump now. Buying newer vehicles and replacing the battery as...

The contact clips that come with these Li-ion units are marginal at best, it pays to make sure they have good contact to get the best out of them. The heavier lead-acid units seem to not have this...

I'd go for a li-ion type over the older tech lead-acid versions. They work ok, but are more prone to leaking and don't like getting banged about as well as being a lot more bulky and a damn sight...