diff --git a/mpmaster/src/main/cpp/mpmaster.cpp b/mpmaster/src/main/cpp/mpmaster.cpp
index 8f827bc3..55e5accb 100644
--- a/mpmaster/src/main/cpp/mpmaster.cpp
+++ b/mpmaster/src/main/cpp/mpmaster.cpp
@@ -239,7 +239,7 @@ Java_com_xypower_mpmaster_MpMasterService_getBatteryInfo(JNIEnv *env, jclass cla
         return NULL;
     }
     std::vector<uint8_t> data;
-    data.resize(0, sizeof(int) + sizeof(int) + sizeof(uint64_t));
+    data.resize(sizeof(int) + sizeof(int) + sizeof(uint64_t), 0);
     size_t length = fread(&data[0], 1, data.size(), file);
     fclose(file);
     if (length < data.size())
diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java b/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
index ec28fb33..bd3e758e 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
@@ -281,12 +281,12 @@ public class AppMaster {
 
             try {
                 long[] batteryInfo = MpMasterService.getBatteryInfo();
-                String battery = "";
                 if (batteryInfo.length == 3 && batteryInfo[2] > 0) {
-                    battery = Float.toString(batteryInfo[0] / 1000) + "V/" + Float.toString(batteryInfo[1] / 1000) + "V";
+                    String battery = Float.toString(batteryInfo[0] / 1000) + "V/" + Float.toString(batteryInfo[1] / 1000) + "V";
+                    postParams.add(new Pair<String, String>("battery", battery));
+                    postParams.add(new Pair<String, String>("bvTime", Long.toString(batteryInfo[2])));
                 }
 
-                postParams.add(new Pair<String, String>("battery", battery));
             } catch (Exception ex) {
                 ex.printStackTrace();
             }