t1990le: I have two vehicles with systems. Both are running old school Soundstream amplifiers. 1994 Chevy 3/4 ton truck, towing package, 4x4, 454 BB. 2006 Infiniti G35 6 speed sedan. My concern is that I have several old school Orion amplifiers now (and thank you to the people on this site for helping me when I posted to get help buying them), three HCCA 250's and one 2100 HCCA, all first or second generation (made in USA). The current draw versus voltage supplied is something I will be concerned about if I put three of these in my Infiniti, which is now running three Soundstream Reference 500 amplifiers. The truck I was just thinking of swapping out the battery for one of these power cells, the biggest one I can fit in there.
Kinetik recommends using a power cell for the main battery and the one in the trunk so that there are not charging system issues with the differential in the rate of discharge between their power cells and a standard battery.
For those cynical persons who want to supply China with our money, I feel sorry for you. Yes, there are batteries manufactured here in the US. And if you are happy paying a Chinese citizen pennies to produce something that is sold for huge profit here rather than put Americans to work in manufacturing here, then don't complain about all the Americans out of work. I personally prefer to divert my money to US labor or if I can't find it for the product I want then to Japan or Europe or Taiwan.