Most helpful critical review
136 of 146 people found the following review helpful
Works sort of as-advertised, but no substitute for real jumper cables for really dead batteries.
on December 7, 2005
This works, but you you have to realize its limitations. It is limited primarily by the fact that it can only slowly move power into a working battery in another car that happens to have run-down its charge.
It will let you get enough charge into a well-working car battery in order to start a car.
It will NOT, however, let you move enough power from one car to another to start a car that currently has an old, broken or worn out "dead battery." For that you'll still need jumper cables, an AC starter, a jump box OR a new battery to get a car going that has a truly dead battery.
This product is a great, safe idea, and it'll let you get a car going when someone let the battery run down, BUT, it will not let you jumpstart a car when its battery has died due to age or malfunction of the battery itself.
Picture this as a straw moving a bit of power slowly into the discharged-but-working "dead" battery, while you really need a fire hose (jumper cables) to start a car that has a no-longer-working battery.
To summarize : Great when someone left their headlights on, worthless when someone's battery has given up the ghost for good.