There's been a rumor for a while that Powerwall 3 is LFP, but I don't think anyone has actual confirmation on that.
I've seen occasional 18650 builds for DIY powerwalls but the vast majority are using prismatic LFP cells. Way easier to wire up, cheaper (unless you have a secret source for surplus 18650s), and minimal fire risk.
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PowerWalls use NMC cells. And the majority of "diy powerwall" builds are reclaimed 18650 cells.
There's been a rumor for a while that Powerwall 3 is LFP, but I don't think anyone has actual confirmation on that.
I've seen occasional 18650 builds for DIY powerwalls but the vast majority are using prismatic LFP cells. Way easier to wire up, cheaper (unless you have a secret source for surplus 18650s), and minimal fire risk.