Open Access

Table 3

Comparisons of energy storage devices.

Item Super capacitor Lead-acid battery Lithium-ion battery Flywheel
Energy density High Standard High
Design life 15 years 10 years 20 years Long with maintenance
Autonomy 1 s 30 s ∼ 15 min 30 s ∼ 15 min 10 ∼ 15 s
Ambient temperature 25 °C 25 °C 40 °C
Etc. High discharge Very high cycle life

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