"Yep,I agree with above about weight for a small flying rig. Handheld is what I do most of...gyromatic.com.au
We use 12v 1500mah lithium Ion. I still like the idea of eneloop style Nicads powering a handheld gimbal. You can leave it for a month and…"
"Sorry, I missed the "Iris" part. For weight reasons you can just use power from your onboard battery. If you want best performance then I still say separate power supply from a small Nicad. "