diff --git a/app/src/main/cpp/PhoneDevice.cpp b/app/src/main/cpp/PhoneDevice.cpp
index 229412b0..27bbf048 100644
--- a/app/src/main/cpp/PhoneDevice.cpp
+++ b/app/src/main/cpp/PhoneDevice.cpp
@@ -438,8 +438,16 @@ bool CPhoneDevice::QuerySystemProperties(std::map<std::string, std::string>& pro
         else if (it->first == (PROP_BATTERY_VOLTAGE))
         {
             // double val = GpioControl::getBatteryVoltage() * 3.0 / 1000.0;  // // BatVol
-            double val = GpioControl::getBatteryVoltage() / 1000.0;  // // BatVol
+            double val = -1;  // // BatVol
             char str[32] = { 0 };
+            for (int idx = 0; idx < 3; idx++)
+            {
+                val = GpioControl::getBatteryVoltage() / 1000.0;  // // BatVol
+                if (val >= 0)
+                {
+                    break;
+                }
+            }
             snprintf(str, sizeof(str), "%.1f", val);
             it->second = str;
         }