HI there.  I have this  PW7015L power companion that I use with my XPS 15 9550 and it works good. I also see Dell sells the smaller one as well called the PW7015M.

1. I read that this pw7015 is compatible with the 9560.  Is that true and can others confirm this?  Now i want to know, does anyone know if its compatible with the 9570?  What about the new dell xps that just came out, the 7590?  I like to know if these could be used for all xps 15 such as the 9570 and 7590.  I assume ppl here have this powerbank and gotten new xps.  Can anyone tell me if its compatible with the 9570 or maybe 7590?

2.  The pw7015m i read is the smaller one and gives much less of a charge.  I read that its compatible with the 9560 as well.  Does anyone know if it works with the 9570 or 7590?  Now the most important question i have is this.  If your laptop battery is low, can you charge the pw7015m to it while you are using your laptop?  What about you using your laptop while using a lot of cpu?  I read that the pw7015m doesn't have enough power for that?  That its only meant to be used when laptop has low battery and you want to charge it while laptop is turned off or turned on but you are doing very light work on it.  Can anyone confirm this?  Because the pw7015l, even when you are low in battery and then plug it in, i have no issues using it while doing my regular thing which is a bit intensive on my cpu terms of cpu usage.