I've used the jump start pack since I got a powered mount, and I can tell you they are fine. I've had the same 1900amp-h battery for about 3 years and it's still going strong. I've given a good beating as well, I use them when I'm camping as power for everything and they still keep going.
I have a 600(minimum you would want IMO) 900 and a 1900.
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