To be honest, I don't like the climax at the end. I feel like it cheapens the ending and ends the story too abruptly. I think somewhere around 3/4th to be the best place for a climax. As mentioned above: LotR
There can still be a lot to write about in the aftermath, how some characters deal with what ever happened, how they fix something else, how they changed, etc.
For me, it doesn't even need to be the end. At times, climax could easily fit in the middle as being the action responsible for making the protagonist to try and resolve the problem instead of making the climax the part where it is resolved. Imagine a person responsible for a war gets stuck in some huge battle in the middle of the book. It would be the climax, but not the end, as that battle will make him realize how pointless or bad the war he started is, and spend the second half of the story trying to fix it. Yes, the end might not be as grand as the middle, but it can still be interesting and not have the reader go "what? this is it?" after 3-4 chapters of this huge battle reaching its peak, then have a small last chapter going "With all the action over, he sat down in his comfy chair, sipping on a cup of his favorite cheap tea. THE END"