In case you don’t already know, the AM04 is simply a rewrap of the Ampace JP40. I got AM04 from this web site HERE. What I really wanted was the Ampace JP40 but after ordering I found out they didn’t have it in stock (even though website stated they did). So after about a 3 week wait for JP40 without success, I was sent the AM04. It performed exceedingly well wrt current supply for Turbo output, consistently beating all my other high current batteries, until this Nightwatch killed 2 out of the 3 AM04’s I had.
Were I to do it again, I would order JP40, and it appears they’re in stock at both Convoy and this shop below (no personal experience with ordering from them) .