The time has come, when Lithium Batteries are starting to reverse the pricing trajectory, they have since the 1980s only ever become cheaper for ever increasing capacity of Batteries.
Now in 2021, the price trend is reversing. As you can see in this very well researched youtube channel by the Electric Viking. The price of Lithium Carbonate has increased by 170% this year alone. Sure other factors play a part, but since the price per KWH fell to under $100USD, the demand spiked and the amount of car manufacturers is also growing at a dramatic pace, my guess for the next 10 years is some ups and downs probably within 100-200% of current pricing. Meaning we will see prices for LFP Batteries around the $200USD a KWH in the DIY Market.
For pre assembled professional CEC approved house batteries such as LG produces, the price per KWH will likely stay around $500 USD KWH plus Installation, which in Australia is extremely expensive due to our extremely high Labour costs.