diff --git a/src/controllers/connector/Profile.js b/src/controllers/connector/Profile.js
index be4c7e5..8571e7f 100644
--- a/src/controllers/connector/Profile.js
+++ b/src/controllers/connector/Profile.js
@@ -59,9 +59,23 @@ class Profile extends AbstractFeed {
             { chargers: true, _id: false },
             { lean: true }
         );
+
+        profile.chargers = this._calculateChargers(profile);
+
         return profile.chargers;
     }
 
+    _calculateChargers(chargers) {
+        const chargerValues = {};
+
+        for (const charger of Object.keys(chargers)) {
+            // todo: wait for core team and add formula
+            chargerValues[charger] = chargers[charger].value;
+        }
+
+        return chargerValues;
+    }
+
     async _detectSubscription(modelObject, currentUserId, requestedUserId) {
         if (!currentUserId) {
             return;
diff --git a/src/controllers/prism/Profile.js b/src/controllers/prism/Profile.js
index 33669b6..2c98ba6 100644
--- a/src/controllers/prism/Profile.js
+++ b/src/controllers/prism/Profile.js
@@ -137,7 +137,7 @@ class Profile extends Abstract {
                 userId,
             },
             {
-                $set: { [path]: chargePercent },
+                $set: { [path]: { value: chargePercent, lastUpdated: Date.now() } },
             }
         );
 
diff --git a/src/models/Profile.js b/src/models/Profile.js
index 36cad96..e99f973 100644
--- a/src/models/Profile.js
+++ b/src/models/Profile.js
@@ -15,20 +15,44 @@ module.exports = MongoDB.makeModel(
         },
         chargers: {
             votes: {
-                type: Number,
-                default: 100,
+                value: {
+                    type: Number,
+                    default: 100,
+                },
+                lastUpdated: {
+                    type: Date,
+                    default: Date.now(),
+                },
             },
             posts: {
-                type: Number,
-                default: 100,
+                value: {
+                    type: Number,
+                    default: 100,
+                },
+                lastUpdated: {
+                    type: Date,
+                    default: Date.now(),
+                },
             },
             comments: {
-                type: Number,
-                default: 100,
+                value: {
+                    type: Number,
+                    default: 100,
+                },
+                lastUpdated: {
+                    type: Date,
+                    default: Date.now(),
+                },
             },
             postbw: {
-                type: Number,
-                default: 100,
+                value: {
+                    type: Number,
+                    default: 100,
+                },
+                lastUpdated: {
+                    type: Date,
+                    default: Date.now(),
+                },
             },
         },
         personal: {