[CAP-XX Pty Limited]

Electrical Specifications
The HS108 is a single cell supercapacitor. The HS208 is a dual cell supercapacitor with two HS108 cells in series, so HS208 capacitance = Capacitance of HS108/2 and HS208 ESR = 2 x HS108 ESR.

Definition of Terms
In its simplest form, the Equivalent Series Resistance (ESR) of a capacitor is the real part of the complex impedance. In the time domain, it can be found by applying a step discharge current to a charged cell as in Fig. 1. In this figure, the supercapacitor is pre-charged and then discharged with a current pulse, I =1A for duration 0.01 sec.