My wife called me because her car would not start. My son had just put a new battery in it. I had bought a lithium-ion jump starter for her car only the week before. I connected the jump starter and the car fired right up, but stopped as soon as I disconnected it. So because she had to get to work and I needed the other vehicle, I left the jump starter connected and drove it to her work a few miles, she followed in the other vehicle. Once there I jumped her car several times while diagnosing her car. It turned out it needed a new cable and terminals. After all that the jump starter still had a 60% charge remaining! And it still works fine! The short of this is that if the extra cost of a lithium battery is not an issue, I would prefer them to lead acid batteries. William
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