Was on location the other morning and round the corner from us in a different cove was a bunch of people doing a music video, they were shooting it with two drone like remote 'copters carrying a red on one and a 5D on the other...
Anyway at lunch their crew were eating just up from my crew and I got chatting to the guys re charging their batteries... To cut a long story short when i showed them the 'before and after' Porty batteries they were impressed and were already trying to see how they could graft them on to their rigs....
The relevant point of the conversation was this:
The reason why our new LiFePO4 Batteries cut out when we try to use full power is because of the C rating, apparently the C rating relates to how much can be drawn 'in one hit' to make it simple. Not sure what mine are but in the UK a good rating is 4.5.
I'm guessing ours are not that high hence the tripping out. Found this thread
too, it explains it really well.
Also, if you want to sourch these, then google something like LiFePO4 Batteries if you haven't already.
In the UK the batteries cost me £100ea delivered, buying from Hensel including the drawer is £432 plus delivery, so 4 batteries DIY is £400 or 4 new ones from the dealer £1728 plus shipping..
What I did was buy two of the new lighter cells and fitted them myself, in addition I also bought and fitted two conventional cells and fitted them myself, two heavy, two light.
Most jobs don't need full power, fast recycle. When they do I have the two traditional batteries, everyday location shooting I take the two lighter cells, leave the two heavier ones in the car/van/truck and my assistants speak to me again...