Funny story, got this just in time to use in my mum's car because she ended up leaving the headlights on and draining the battery. I charged this battery the night before to make sure it was fully charged before even trying it. It was easy to connect the battery and then mom started the car. It took several attempts, but in the end we were able to start the car. We let it charge for a few seconds and removed the jumper. I have to admit that I have other jumpers that work much better than this one. To be honest I don't feel like it's powerful enough to drive a car or truck. Well for smaller vehicles like lawn mowers, 4 wheelers etc I think this would be ideal and there would be no problem starting with this jumper. go again and he did just that. So, can't fault it too much.
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