hi there
i just found a few old Sony infolithium batteries (one is the pretty big NP F750)

do you guys think they would work on the Z1?
thanks
Fed

It should work, but if it's more than a couple of years old it may not hold a charge very well. I've found these batts have about a 2-3 year lifespan. And it's possible the cam might throw an error message but it'll still probably work anyway.

Any NPF will work on the Z1 Federico. I use ancient 330s that I'd bought for my TRV900 back in the 90s, and they work well on the Z1. I've had one 330 fail, but I'm nowhere near as pessimistic as Adam - lots of my Info-lithiums are 5 - 10 years old and working well.