diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java b/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
index 823fa606..7fe1f20b 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
@@ -282,7 +282,8 @@ public class AppMaster {
             try {
                 long[] batteryInfo = MpMasterService.getBatteryInfo();
                 if (batteryInfo.length == 3 && batteryInfo[2] > 0) {
-                    String battery = Float.toString(batteryInfo[0] / 1000.0f) + "V/" + Float.toString(batteryInfo[1] / 1000.0f) + "V";
+                    String battery = Long.toString(batteryInfo[0] / 1000) + "." + Long.toString((batteryInfo[0] % 1000) / 100) + "V/"
+                            + Long.toString(batteryInfo[1] / 1000) + "." + Long.toString((batteryInfo[1] % 1000) / 100) + "V";
                     postParams.add(new Pair<String, String>("battery", battery));
                     postParams.add(new Pair<String, String>("bvTime", Long.toString(batteryInfo[2])));
                 }