Electrochemical batteries, such as lithium-ion and lead acid, need electricity to charge, whereas the ENERGYNEST ThermalBatteryTM charges with heat. This means that the ThermalBatteryTM can be used for applications (such as combined heat and power) which are not physically possible with electrochemical batteries.
Moreover, the ThermalBatteryTM has a significantly longer lifetime, near-zero performance degradation, in addition to being made of fully recyclable materials. These materials primarily consist of steel and concrete, which are cheap and globally available commodity materials. This is why the system comes at a significantly lower cost than batteries.