Pete. Many thanks for the information you passed on. I too have a bundle of batteries in my kit for field work too. This week I was in Hilo at a garden shot, and went ther a ton of batteries. I started to wonder why this was happening... I genially don’t use batteries this quickly. Until I realized the hot humid conditions may have been part of my drain.
Is it possible environmentals could be a cause?
Meantime you’re right I will bring my Canon workhorse with me for my next large shoot.
Thanks again!