No. LiFePo4. It's much safer and easily handled most loads and charging. There are some new chemistries coming onto the market that are even better, but the scale and density makes them more expensive and too heavy for my application at this time.

I'm not sure what "real products" are using these days. I pay very little attention to that since I build my own as it's way, way cheaper. My ~5kWh pack works flawlessly, though, there's a few things that I know I should do to increase safety and usability in not so far fetched circumstances, and, I do need much more battery discharge capacity since I have dual 3kw inverters (set up to run 240V split phase to supply an eventually installed heat pump that will by my main source of heat and cooling) that can draw more amps than this pack is designed to handle, though, I don't worry much about that since as long as the grid is up and solar is coming in, both of those sources can be prioritized and the batteries can be saved for an outage.