Predict EMPs (#39802)

* predicted emps

* fixes

* fix

* review

Content.Shared/Power/Components/BatteryComponent.cs

@@ -0,0 +1,34 @@
+using Content.Shared.Power.EntitySystems;
+using Content.Shared.Guidebook;
+
+namespace Content.Shared.Power.Components;
+
+/// <summary>
+/// Battery node on the pow3r network. Needs other components to connect to actual networks.
+/// </summary>
+[RegisterComponent]
+[Virtual]
+[Access(typeof(SharedBatterySystem))]
+public partial class BatteryComponent : Component
+{
+    public string SolutionName = "battery";
+
+    /// <summary>
+    /// Maximum charge of the battery in joules (ie. watt seconds)
+    /// </summary>
+    [DataField]
+    [GuidebookData]
+    public float MaxCharge;
+
+    /// <summary>
+    /// Current charge of the battery in joules (ie. watt seconds)
+    /// </summary>
+    [DataField("startingCharge")]
+    public float CurrentCharge;
+
+    /// <summary>
+    /// The price per one joule. Default is 1 credit for 10kJ.
+    /// </summary>
+    [DataField]
+    public float PricePerJoule = 0.0001f;
+}