Decouple power sink from tickrate (#40789)

* Fix typo in `BatterySystem.ChangeCharge`.

* Decouple power sink behavior from tickrate.

* Fix power sink's price per joule

Content.Server/Power/EntitySystems/BatterySystem.cs

@@ -171,7 +171,7 @@ namespace Content.Server.Power.EntitySystems
             if (!Resolve(uid, ref battery))
                 return 0;
 
-            var newValue = Math.Clamp(0, battery.CurrentCharge + value, battery.MaxCharge);
+            var newValue = Math.Clamp(battery.CurrentCharge + value, 0, battery.MaxCharge);
             var delta = newValue - battery.CurrentCharge;
             battery.CurrentCharge = newValue;
 

Content.Server/PowerSink/PowerSinkSystem.cs

@@ -66,7 +66,7 @@ namespace Content.Server.PowerSink
                 if (!transform.Anchored)
                     continue;
 
-                _battery.SetCharge(entity, battery.CurrentCharge + networkLoad.NetworkLoad.ReceivingPower / 1000, battery);
+                _battery.ChangeCharge(entity, networkLoad.NetworkLoad.ReceivingPower * frameTime, battery);
 
                 var currentBatteryThreshold = battery.CurrentCharge / battery.MaxCharge;
 

Resources/Prototypes/Entities/Objects/Power/powersink.yml

@@ -40,8 +40,8 @@
           acts: [ "Destruction" ]
     - type: PowerSink
     - type: Battery
-      maxCharge: 7500000
-      pricePerJoule: 0.0003
+      maxCharge: 250000000
+      pricePerJoule: 0.000009
     - type: ExaminableBattery
     - type: PowerConsumer
       voltage: High