The battery life is just ok, not great. Mirrorless as a whole has worse life because it's always using the sensor unlike DSLRs but the Z50 doesn't set itself apart there. I keep an extra battery with me for the times I'm going out with the intention of taking a lot of pictures but I've only had to switch once or twice.
1: https://www.nikonusa.com/en/nikon-products/camera-lenses/mir...
The Z50 with the two kit lenses looks like it could replace my D50 + 18-70mm + 70-300mm; the new 50-250mm lens has a shorter reach but shouldn't be a big issue on a crop sensor, and would be lighter than the 70-300mm. Using the adaptor to allow use of the wide and micro lens may tide me over until Z equivalents are available. Reading reviews and watching for a good sale is where I'm at now.
How is the battery life for the Z50? I've read that is a common issue with new mirrorless rigs.