I have been wanting to build an external battery to use with my Zaxcom bag rig consisting of a Nomad 10 and Zax wires (QrX200 and 2 TRX's) for days when I am not needing to carry the bag and I can use my small cart. I'd like to keep in a small pelican type case and I am thinking along the lines of making it so I can power to my BDS so it would be a fast switch over from my bag batteries. I've been doing my own research around and trying to figure out the right setup when it comes to voltage, watts, amps, etc. I am a complete amateur at this so please forgive my ignorance. Like I said I have done some research but I wanted to also get some advice from the great sound community we have here. I have also tried to seek out past posts on here but haven't really found quite what I am looking for.
I did find this post that seemed promising.
http://jwsoundgroup.net/index.php?/topic/9087-dc-pelican-battery/&
Your vast and valuable knowledge is most appreciated. Thanks.