diff --git a/lib/plugins/xdrip-js.js b/lib/plugins/xdrip-js.js
index 677d2b42674..d66f112cfcf 100644
--- a/lib/plugins/xdrip-js.js
+++ b/lib/plugins/xdrip-js.js
@@ -172,7 +172,7 @@ function init(ctx) {
         result.level = levels.WARN;
       }
 
-      if (sensorInfo.xdripjs.voltageb && (sensorInfo.xdripjs.voltageb < prefs.warnBatV)) {
+      if (sensorInfo.xdripjs.voltageb && (sensorInfo.xdripjs.voltageb < (prefs.warnBatV - 10))) {
         sendNotification = true;
         message = 'CGM Battery B Low Voltage: ' + sensorInfo.xdripjs.voltageb;
         title = 'CGM Battery Low';