Analysis of information sources in references of the Wikipedia article "Sodium-ion battery" in English language version.
The data shows all technologies delivering between 85–95% DC round-trip efficiency.
Lead–acid batteries have a ... round trip-efficiency (RTE) of ~70–90%
The (round trip) energy efficiency of sodium-ion batteries is 92% at a discharge time of 5 hours.
Lead–acid batteries have a ... round trip-efficiency (RTE) of ~70–90%