I have a different type but I can confirm that it will start a V8 with a completely flat battery. Over the winter my battery went flat. and I mean flat, not even enough power to light a bulb, I threw on my booster pack, turned the key and it started first time.
I have started my V8 4 times with it, my kid has used it on his friends car several times and it has only now went to half charge from its initial charge over a year ago.
A worthwhile investment.
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