As I often say: THe faster you discharge the battery the faster*Faster it runs down (Thanks Mena for the spelling) thanks to Mr. Puekert (I can never remember ho to spell that).
What you have done is prove his findings.
Try amp hours/20 for the current load and see how the batteries do.
Also: Batteries are designed differently depending on their intended use. Those jump packs are designed to provide very very very high current, 17 Amp Hours sounds like about a 750 to 900 amp peak pack.
A "Deep cycle" design may not be able to provide that kind of current. But you can suck a larger precentage of the charge before bad things happen.
GOOD analyzer though.
