It is difficult to predict the the Lithium prices over a 5 years horizon. Some analysts say that the prices may harden over 5 to 7 years , primarily due to China controlling the raw material prices and the world demand surging. However we can quite definitely forecast the 2 to 3 years price trends based on the capacities being built across the world and R&D costs getting amortised.
Currently the Lithium battery packs with basic BMS and with the popular chemistry like NMC, LMO etc are hovering at around 225 ~250 USD/kWhr. These prices are expected to be in the range of 160 to 180 USD/kWhr by 2020.
The cost components of the inputs that go into making a lithium batteries are likely to undergo the following changes