the hosa should last no problem if you have something like a 1600mah battery
the jb3 should recharge in the car, go to walmart, get the powerline series 4.5 volt adapter we all love and use and that will charge your jb3 QUICK in the car, the thing pumps out 2000mah, i recharged my jb3 after every nite phish from the 23rd to the 26th and the car adapter did REALLY well, charging my jb3 after a nite of recording phish and listening to t00nes all nite, it took about an hour, maybe an hr and a half to fully charge
as for the eco charge, what are you powering it with
also, what kind of eco are you using???
that thing should get ya about many hrs depending on what youre running