Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Is this compatible with the new Canon Speedlite 600 Ex-RT?
Document: I picked this up with the Yongnuo YN-565EX ETTL Speedlite Flash for Canon with hopes it would turn out as good as I knew the flash was going to be. Yeah, not disappointed.The body of this pack is plastic, with a simple slide-off mechanism for the battery compartment. However, the plastic is quite heavy and flexible, and feels like it will last well, especially when padded in the included nylon case.
This product arrived quickly and was extremely easy to set up and install on to my Canon 580 EX II flash. It also worked great for about one month.Quick flash recycling time. Lasting throughout events. Then suddenly it stopped working in the middle of an event. New batteries didn't help. Adjusting the contacts were no help either.I'd recommend this Battery Pack to anyone that's taking pictures at an event that I'm taking pictures at also.Thanks
I also have 2 Canon battery packs that have worked flawlessly for many years.
Fits in well with all my girlfriend's other canon products. it's only missing the canon logo. works well with the 7D.
Unit did not work with Canon flash. The craftsmanship is poor. The battery compartment did not fit well. Had to push very hard.
This battery pack works well. It's a good value compared to the Canon product. I'd do it again if I need another.
I thought this would be a great alternative to the more expensive canon version but it was not. I used it twice and then it stopped working unexpectedly. Very disappointed.
Great price for a non-Canon brand product. Would highly recommend. I use these on a monopod with with 580EXII both for outdoor shooting and sometimes in the studio.
Exercising reasonable care should result in a long life for this unit. It is certainly worth the price paid and at about 1/4th the cost of the Canon unit, it's a no brainer.
THIS IS THE ANSWER. And I've never seen a better (or faster) option, and that includes the 'name brand' Canon version (which is 4 times the cost).
Answer: Stay away from this pile of junk.  I returned one after it stopped working...the replacement stopped working within a month.  I chalked it up as a loss and just bought the Canon units which have performed flawlessly.