Found some GP 3300 NIMH cells wihch are known to be ultra reliable. For anyone else looking to do something like this Ive heard nothing but amazing recommendations about this site for batteries:
he uses top quality cells, Im gonna order one of his "battle" packs soon and have him split to two 6v packs for my Metz. EP cells are top quality and its really hard finding the good NIMH these days....
Should be cheaper than the dryfit, much lighter, and provide faster recycling time. Not sure what the amp draw rating on the dryfit is but on these NIMH's its through the roof!
Just sent Metz an email about current draw on the battery from the CT1-4 packs.