That's very promising news. So battery life is somewhere between 3 and 14 hours
In any case, my "buy-o-meter" needle has now move back into the M1 Max camp. Although I love the idea of never having to consider battery life on a laptop, in practice it is not going to be a big deal for me because I am rarely away from a power source for the whole day. For those occasions, if I can get 7-8 hours of my normal work usage out of it, I will be happy. I might look at a smaller travel charger or powerbank to avoid "range anxiety" if I expect to be unplugged for an extended time.
I've been doing some video editing on my 2019 MBP16 recently and getting quite frustrated by the heat, fan noise, and lackluster performance with H.264 4K video, or the hassle of filling up my disks with proxies and optimized media. I think the M1 Max would provide a nice boost for this usage.