Add tank types that can only contain EC

GameData/RealismOverhaul/RO_RealFuels.cfg

@@ -511,6 +511,38 @@ TANK_DEFINITION
 	}
 }
 
++TANK_DEFINITION[SM-I]:FIRST
+{
+	@name = Battery-I
+}
+
++TANK_DEFINITION[SM-II]:FIRST
+{
+	@name = Battery-II
+}
+
++TANK_DEFINITION[SM-III]:FIRST
+{
+	@name = Battery-III
+}
+
++TANK_DEFINITION[SM-IV]:FIRST
+{
+	@name = Battery-IV
+}
+
+@TANK_DEFINITION[Battery-I|Battery-II|Battery-III|Battery-IV]:FIRST
+{
+	!highlyPressurized = DEL
+	!addResources = DEL
+	!addResourcesHP = DEL
+	!addResourcesSM = DEL
+	!addLead = DEL
+	!addPayload = DEL
+	!addSoundingPayload = DEL
+	@maxUtilization = 100
+}
+
 // PARTUPGRADEs for available types
 // ServiceModule Upgrades
 PARTUPGRADE
@@ -552,6 +584,47 @@ PARTUPGRADE
 	description = Level IV Service Module Tanks are similar to ones used by Apollo. These are heavy tanks with poor utilization that simulates the supporting structures and systems needed for the specialized payloads. <b><color=green>Max Utilization: 75% </color><color=white>Can Hold Satellite Payload, Electric Charge, and Life Support Supplies</b></color> These are 45% lighter than level III service module tanks while costing 14% more to tool and 7% more once tooled.
 }
 
+// PARTUPGRADEs for available types
+// Battery Upgrades
+PARTUPGRADE
+{
+	name = RFTech-Battery-II
+	partIcon = RO-RFTank-Separate
+	techRequired = electronicsHuman
+	entryCost = 0
+	cost = 0
+	title = Battery Tank Upgrade
+	basicInfo = You can now use level II Battery tanks
+	manufacturer = Generic
+	description = Level II Battery Tanks are similar to ones used by Mercury and Vostok.
+}
+
+PARTUPGRADE
+{
+	name = RFTech-Battery-III
+	partIcon = RO-RFTank-Separate
+	techRequired = electronicsAdvCapsules
+	entryCost = 0
+	cost = 0
+	title = Battery Tank Upgrade
+	basicInfo = You can now use level III Battery tanks
+	manufacturer = Generic
+	description = Level III Battery Tanks are similar to ones used by Gemini and Voskhod.
+}
+
+PARTUPGRADE
+{
+	name = RFTech-Battery-IV
+	partIcon = RO-RFTank-Separate
+	techRequired = electronicsLunar
+	entryCost = 0
+	cost = 0
+	title = Battery Tank Upgrade
+	basicInfo = You can now use level IV Battery tanks
+	manufacturer = Generic
+	description = Level IV Battery Tanks are similar to ones used by Apollo.
+}
+
 PARTUPGRADE
 {
 	name = RFTech-AddLifeSupport

GameData/RealismOverhaul/RO_RealFuels_PartConfigs.cfg

@@ -220,6 +220,41 @@
     }
 }
 
+@PART:HAS[#roTankType[battery]]:FOR[RealismOverhaulTankTypes]
+{
+    @description = Specialized tanks for batteries. There are different levels of batteries that you can unlock. Each tank type has a different base mass, different cost, and different amounts of utilization it can have.
+
+    @MODULE[ModuleFuelTanks]
+    {
+        type = Battery-I
+        typeAvailable = Battery-I
+        %UPGRADES
+        {
+            UPGRADE
+            {
+                name__ = RFTech-Battery-II
+                description__ = You can now use level II Battery tanks
+                IsAdditiveUpgrade__ = true
+                typeAvailable = Battery-II
+            }
+            UPGRADE
+            {
+                name__ = RFTech-Battery-III
+                description__ = You can now use level III Battery tanks
+                IsAdditiveUpgrade__ = true
+                typeAvailable = Battery-III
+            }
+            UPGRADE
+            {
+                name__ = RFTech-Battery-IV
+                description__ = You can now use level IV Battery tanks
+                IsAdditiveUpgrade__ = true
+                typeAvailable = Battery-IV
+            }
+        }
+    }
+}
+
 @PART:HAS[#roTankTypeDescription]:FOR[RealismOverhaulTankTypes]
 {
     @description = #$roTankTypeDescription$