I noticed one post where it was mentioned RED warned a customer his warranty could be voided due to using Global Media batteries.
In another post, a RED user said he was charged over a thousand for a repair involving for using 3rd party accessories, as they invalidated his warranty.
I notice a lot of people using AB and Global Media batteries on the Epic and Scarlet forums, both seem well regarded.
But, I've got some concerns now about how 3rd party accessories affect the warranty.
Are there other things that will void warranty that seem to be commonly done?
There was some initial confusion on my part about the 2nd post being about GMP batteries. It turned out I was mistaken, and the invalidated warranty was due to some other 3rd party power accessories.
So, the title of this thread may be misleading as to whether or not there are issues specifically with GMP batteries. I've never heard of any user complaints, so ... I'm not aware of any.
There's some clarification by RED on several posts in this thread that basically seem to say, if a 3rd party accessory damages the camera, your warranty is void. Fair enough. (BTW - the main problems reported by RED have to do with 3rd party power and audio - with audio being exceedingly problematic, often mis-wired. FYI - Do NOT plug your line level into the mic input - and with the phantom power getting enabled soon, be dead certain your audio wiring is correct, or be dead)
But, there's still some confusion as to whether just using a 3rd party accessory, one that is not defective, will void one's warranty.
I'm sure this will get cleared up shortly, and I'll probably edit this initial post again.