diff --git a/apps/bthrm/lib.js b/apps/bthrm/lib.js
index 7f60d2624..d4cb7412c 100644
--- a/apps/bthrm/lib.js
+++ b/apps/bthrm/lib.js
@@ -16,6 +16,14 @@ exports.enable = () => {
 
   log("Settings: ", settings);
 
+  //this is for compatibility with 0.18 and older
+  let oldCache = require('Storage').readJSON("bthrm.cache.json", true);
+  if(oldCache){
+    settings.cache = oldCache;
+    require('Storage').writeJSON("bthrm.json", settings);
+    require('Storage').erase("bthrm.cache.json");
+  }
+
   if (settings.enabled && settings.cache){
 
     log("Start");
diff --git a/apps/bthrm/settings.js b/apps/bthrm/settings.js
index 5609fe215..4f52683ff 100644
--- a/apps/bthrm/settings.js
+++ b/apps/bthrm/settings.js
@@ -129,11 +129,9 @@
     "0x2a19", // Battery
   ];
 
-  var characteristicsToCache = function(characteristics, deviceId) {
+  var characteristicsToCache = function(characteristics) {
     log("Cache characteristics");
-    let cache = {
-      id: deviceId
-    };
+    let cache = {};
     if (!cache.characteristics) cache.characteristics = {};
     for (var c of characteristics){
       //"handle_value":16,"handle_decl":15
@@ -240,7 +238,7 @@
 
     return promise.then(()=>{
       log("Connection established, saving cache");
-      characteristicsToCache(characteristics, deviceId);
+      characteristicsToCache(characteristics);
     });
   }