 This paper proposes a new method for estimating the parameters of a 400v Li-ion battery bank in real time. It uses an adaptive stabilization algorithm to quickly converge on accurate parameter values without requiring any preliminary testing or post-processing. This makes it possible to continuously update the parameters while the EV is running, allowing for more precise control of the battery's output. The algorithm was tested on a 400v, 6.6 Li-ion battery bank and shown to be effective at accurately estimating the battery's parameters. This article was authored by Shayak Mukhopadai, Hafiz M. Usman and Habibah Rayman.