diff --git a/Changelog.md b/Changelog.md
index d84a9ad6a..a4e41c7ca 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,8 @@
+## OpenStudio-ERI v1.12.0
+
+__New Features__
+- The `NominalCapacity` input for batteries is no longer used.
+
 ## OpenStudio-ERI v1.11.1
 
 __New Features__
diff --git a/docs/source/workflow_inputs.rst b/docs/source/workflow_inputs.rst
index 5f630a8c4..4f86ed02d 100644
--- a/docs/source/workflow_inputs.rst
+++ b/docs/source/workflow_inputs.rst
@@ -2483,8 +2483,7 @@ A single battery can be entered as a ``/HPXML/Building/BuildingDetails/Systems/B
   ``IsSharedSystem``                                    boolean                                      Yes                 Whether it serves multiple dwelling units
   ``Location``                                          string              See [#]_                 No        See [#]_  Location
   ``BatteryType``                                       string              See [#]_                 Yes                 Battery type
-  ``NominalCapacity[Units="kWh"]/Value``                double   kWh        >= 0                     Yes                 Nominal (total) capacity
-  ``UsableCapacity[Units="kWh"]/Value``                 double   kWh        >= 0, < NominalCapacity  Yes                 Usable capacity
+  ``UsableCapacity[Units="kWh"]/Value``                 double   kWh        >= 0                     Yes                 Usable capacity
   ``RatedPowerOutput``                                  double   W          >= 0                     Yes                 Power output under non-peak conditions
   ``RoundTripEfficiency``                               double   frac       > 0, <= 1                Yes                 Round trip efficiency
   ``extension/NumberofBedroomsServed``                  integer             > NumberofBedrooms       See [#]_            Number of bedrooms served
diff --git a/rulesets/resources/301ruleset.rb b/rulesets/resources/301ruleset.rb
index c57c43cd1..a20b61edd 100644
--- a/rulesets/resources/301ruleset.rb
+++ b/rulesets/resources/301ruleset.rb
@@ -1947,7 +1947,6 @@ def self.set_systems_batteries_rated(orig_bldg, new_bldg)
                                is_shared_system: orig_battery.is_shared_system,
                                type: orig_battery.type,
                                location: orig_battery.location,
-                               nominal_capacity_kwh: orig_battery.nominal_capacity_kwh,
                                usable_capacity_kwh: orig_battery.usable_capacity_kwh,
                                rated_power_output: orig_battery.rated_power_output,
                                round_trip_efficiency: orig_battery.round_trip_efficiency,
diff --git a/rulesets/resources/301validator.sch b/rulesets/resources/301validator.sch
index a5e3b6054..ee2a426d3 100644
--- a/rulesets/resources/301validator.sch
+++ b/rulesets/resources/301validator.sch
@@ -1562,9 +1562,7 @@
       <sch:assert role='ERROR' test='count(h:BatteryType[text()="Li-ion"]) = 1'>Expected 1 element(s) for xpath: BatteryType[text()="Li-ion"]</sch:assert>
       <sch:assert role='ERROR' test='count(h:Location) &lt;= 1'>Expected 0 or 1 element(s) for xpath: Location</sch:assert>
       <sch:assert role='ERROR' test='h:Location[text()="conditioned space" or text()="basement - conditioned" or text()="basement - unconditioned" or text()="crawlspace - vented" or text()="crawlspace - unvented" or text()="attic - vented" or text()="attic - unvented" or text()="garage" or text()="outside"] or not(h:Location)'>Expected Location to be 'conditioned space' or 'basement - conditioned' or 'basement - unconditioned' or 'crawlspace - vented' or 'crawlspace - unvented' or 'attic - vented' or 'attic - unvented' or 'garage' or 'outside'</sch:assert>
-      <sch:assert role='ERROR' test='count(h:NominalCapacity[h:Units="kWh"]/h:Value) = 1'>Expected 1 element(s) for xpath: NominalCapacity[Units="kWh"]/Value</sch:assert>
       <sch:assert role='ERROR' test='count(h:UsableCapacity[h:Units="kWh"]/h:Value) = 1'>Expected 1 element(s) for xpath: UsableCapacity[Units="kWh"]/Value</sch:assert>
-      <sch:assert role='ERROR' test='number(h:UsableCapacity[h:Units="kWh"]/h:Value) &lt; number(h:NominalCapacity[h:Units="kWh"]/h:Value) or not(h:UsableCapacity[h:Units="kWh"]/h:Value) or not(h:NominalCapacity[h:Units="kWh"]/h:Value)'>Expected UsableCapacity to be less than NominalCapacity</sch:assert>
       <sch:assert role='ERROR' test='count(h:RatedPowerOutput) = 1'>Expected 1 element(s) for xpath: RatedPowerOutput</sch:assert>
       <sch:assert role='ERROR' test='count(h:RoundTripEfficiency) = 1'>Expected 1 element(s) for xpath: RoundTripEfficiency</sch:assert>
       <!-- Warnings -->
diff --git a/rulesets/tests/test_pv_batteries.rb b/rulesets/tests/test_pv_batteries.rb
index 837e785aa..351ca00eb 100644
--- a/rulesets/tests/test_pv_batteries.rb
+++ b/rulesets/tests/test_pv_batteries.rb
@@ -57,7 +57,7 @@ def test_pv_batteries
 
     _test_ruleset(hpxml_name).each do |(_run_type, calc_type), hpxml_bldg|
       if [CalcType::RatedHome].include? calc_type
-        _check_battery(hpxml_bldg, [{ type: HPXML::BatteryTypeLithiumIon, location: HPXML::LocationOutside, nominal_capacity_kwh: 20.0, usable_capacity_kwh: 18.0, rated_power_output: 6000, round_trip_efficiency: 0.925, is_shared: false }])
+        _check_battery(hpxml_bldg, [{ type: HPXML::BatteryTypeLithiumIon, location: HPXML::LocationOutside, usable_capacity_kwh: 18.0, rated_power_output: 6000, round_trip_efficiency: 0.925, is_shared: false }])
       else
         _check_battery(hpxml_bldg)
       end
@@ -70,7 +70,7 @@ def test_pv_batteries_shared
     _test_ruleset(hpxml_name).each do |(_run_type, calc_type), hpxml_bldg|
       if [CalcType::RatedHome].include? calc_type
         _check_pv(hpxml_bldg, [{ location: HPXML::LocationGround, moduletype: HPXML::PVModuleTypeStandard, tracking: HPXML::PVTrackingTypeFixed, azimuth: 225, tilt: 30, power: 30000, inv_eff: 0.96, losses: 0.14, is_shared: true, nbeds_served: 18 }])
-        _check_battery(hpxml_bldg, [{ type: HPXML::BatteryTypeLithiumIon, location: HPXML::LocationOutside, nominal_capacity_kwh: 120.0, usable_capacity_kwh: 108.0, rated_power_output: 36000, round_trip_efficiency: 0.925, is_shared: true, nbeds_served: 18 }])
+        _check_battery(hpxml_bldg, [{ type: HPXML::BatteryTypeLithiumIon, location: HPXML::LocationOutside, usable_capacity_kwh: 108.0, rated_power_output: 36000, round_trip_efficiency: 0.925, is_shared: true, nbeds_served: 18 }])
       else
         _check_pv(hpxml_bldg)
         _check_battery(hpxml_bldg)
@@ -138,7 +138,6 @@ def _check_battery(hpxml_bldg, all_expected_values = [])
       assert_equal(expected_values[:is_shared], battery.is_shared_system)
       assert_equal(expected_values[:type], battery.type)
       assert_equal(expected_values[:location], battery.location)
-      assert_equal(expected_values[:nominal_capacity_kwh], battery.nominal_capacity_kwh)
       assert_equal(expected_values[:usable_capacity_kwh], battery.usable_capacity_kwh)
       assert_equal(expected_values[:rated_power_output], battery.rated_power_output)
       assert_equal(expected_values[:round_trip_efficiency], battery.round_trip_efficiency)
diff --git a/tasks.rb b/tasks.rb
index 847c6a066..6b74dd318 100644
--- a/tasks.rb
+++ b/tasks.rb
@@ -2773,6 +2773,7 @@ def create_sample_hpxmls
       battery.is_shared_system = false if battery.is_shared_system.nil?
       battery.location = nil
       battery.round_trip_efficiency = 0.925
+      battery.nominal_capacity_kwh = nil
     end
     n_htg_systems = (hpxml_bldg.heating_systems + hpxml_bldg.heat_pumps).select { |h| h.fraction_heat_load_served.to_f > 0 }.size
     n_clg_systems = (hpxml_bldg.cooling_systems + hpxml_bldg.heat_pumps).select { |h| h.fraction_cool_load_served.to_f > 0 }.size
diff --git a/workflow/sample_files/base-battery.xml b/workflow/sample_files/base-battery.xml
index 911af36c4..dcca59527 100644
--- a/workflow/sample_files/base-battery.xml
+++ b/workflow/sample_files/base-battery.xml
@@ -415,10 +415,6 @@
             <SystemIdentifier id='Battery1'/>
             <IsSharedSystem>false</IsSharedSystem>
             <BatteryType>Li-ion</BatteryType>
-            <NominalCapacity>
-              <Units>kWh</Units>
-              <Value>20.0</Value>
-            </NominalCapacity>
             <UsableCapacity>
               <Units>kWh</Units>
               <Value>18.0</Value>
diff --git a/workflow/sample_files/base-bldgtype-mf-unit-shared-pv-battery.xml b/workflow/sample_files/base-bldgtype-mf-unit-shared-pv-battery.xml
index e2b7efa5a..7735d0d18 100644
--- a/workflow/sample_files/base-bldgtype-mf-unit-shared-pv-battery.xml
+++ b/workflow/sample_files/base-bldgtype-mf-unit-shared-pv-battery.xml
@@ -335,10 +335,6 @@
             <SystemIdentifier id='Battery1'/>
             <IsSharedSystem>true</IsSharedSystem>
             <BatteryType>Li-ion</BatteryType>
-            <NominalCapacity>
-              <Units>kWh</Units>
-              <Value>120.0</Value>
-            </NominalCapacity>
             <UsableCapacity>
               <Units>kWh</Units>
               <Value>108.0</Value>
diff --git a/workflow/sample_files/base-pv-battery.xml b/workflow/sample_files/base-pv-battery.xml
index ed56aced1..e9f1a750e 100644
--- a/workflow/sample_files/base-pv-battery.xml
+++ b/workflow/sample_files/base-pv-battery.xml
@@ -445,10 +445,6 @@
             <SystemIdentifier id='Battery1'/>
             <IsSharedSystem>false</IsSharedSystem>
             <BatteryType>Li-ion</BatteryType>
-            <NominalCapacity>
-              <Units>kWh</Units>
-              <Value>20.0</Value>
-            </NominalCapacity>
             <UsableCapacity>
               <Units>kWh</Units>
               <Value>18.0</Value>