Power-Efficient Hybrid Energy Storage System for Seismic Nodes

Table 2

Summary of notations and definitions.

Notation	Definition
	Open circuit voltage of the lead-acid battery
	Resistance of the first elemental circuit of RC branch
	Resistance of the second elemental circuit of RC branch
	Capacitance of the first elemental circuit of RC branch
	Capacitance of the second elemental circuit of RC branch
	Internal resistance of the lead-acid battery
	Internal equivalent series resistance
	Internal equivalent parallel resistance
	Lead-acid battery output current
	Supercapacitor output current
	Lead-acid battery output voltage
	Open circuit voltage of the supercapacitor
	Hybrid load current of lead-acid battery and supercapacitor