# description
Typed schema for stationary battery energy storage resources (BESS). v1.1: storageCapacityKwh → storageCapacity (QuantitativeValue); inherits EnergyResourceCommon/v1.1. CIM: cim:BatteryUnit (IEC 61970-302). BATTERY is a deprecated alias for BESS. Optional admin field roundTripEfficiencyPct carries AC-to-AC round-trip efficiency per IEC 62933-2-1.

# allOf[].properties.type.description
Asset-class discriminator. BATTERY is deprecated; use BESS. CIM: cim:BatteryUnit (IEC 61970-302).

# $defs.EnergyResourceStorageAttributes.allOf[].properties.storageCapacity.description
Rated stored-energy capacity. unit: kWh | MWh. CIM: BatteryUnit.ratedE.

# $defs.EnergyResourceStorageAttributes.allOf[].properties.stateOfHealthPct.description
Battery state-of-health as a percentage (0–100).

# $defs.EnergyResourceStorageAttributes.allOf[].properties.roundTripEfficiencyPct.description
AC-to-AC round-trip efficiency (0–100). Energy returned to grid / energy drawn over a full charge/discharge cycle. IEC 62933-2-1. Distinct from stateOfHealthPct.