Hybrid supercapacitors (HSCs) combine the energy density of a lithium-ion battery with the power density and cycle life of a capacitor. Compared with lithium-ion, they charge faster, 97% efficient during cycling, cannot enter thermal runaway, and last 4x longer, for a lifetime cost of energy that is a fraction of any battery.
The result is lithium-ion energy density with capacitor cycle life and none of the thermal runaway risk.
Lower lifetime cost than lithium-ion at a comparable price per kWh: no replacement mid-life, no cooling, no maintenance, and more usable capacity per rated kWh.
Where hybrid supercapacitor storage replaces lead-acid and lithium-ion.
Supercapacitor Energy hybrid supercapacitor modules are listed to UL 1973 (stationary energy storage) and have completed UL 9540A large-scale fire testing. UL 810A (electrochemical capacitors) certification is complete, and production units carry the CSA conformity mark. For your project this means the modules are recognized by the standards that permitting authorities, insurers, and fire marshals reference, without the propagation risk associated with lithium-ion chemistries
Standard for Safety – Electrochemical Capacitors and Functional Safety
Listed for stationary energy storage
Fire-propagation tested: no thermal runaway
The National Fire Protection Association (NFPA), is the building code creation body that determines fire code rules for all Jurisdictions across the United States. In 2025 the NFPA created a new stationary storage category for Hybrid Supercapacitor Batteries (HSC) and gave this energy storage system (BESS) complete exemptions from special considerations for installation in buildings. The new codes are found the 2026 release of the 855 Manual.
The basis for the NFPA decision to create a new category for HSCs is the UL test results Hybrid Supercapacitors have undergone. Our HSCs have been tested to UL 9540A, UL 1973, UL 810A and UL 60730 – Functional Safety. The UL 9540A testing is the thermal runaway testing for batteries. The results of the 9540A test of Hybrid Supercapacitors proved that this energy storage device does not propagate fire beyond the initiating heat source and therefore requires no additional fire prevention steps to be taken in installations below 50 KWh of capacity.
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