oh aha, didnt expect people to respond to the thread after a week. i did end up buying it. so i assume i bought the only unit
. if anyones interested ill test it out in the field and report back. I'm not expecting much out of it but it was lighter and more compact than car jump packs i was looking at. not gonna lie, i was kind of dissapointed at the lack of information on this product. For example, how to charge the damned things and whether or not the two modules are linked so i can use the full 30aH. I'll probably only use it to power my mount. not sure how long it would last if i charge my laptop also