diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2f98b8..b5f26a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -100,7 +100,8 @@ Other changes
 
 | Version        | Date           | Comment  |
 | -------------- | -------------- | -------- |
-| 3.37.1         | 2018-02-13     | fixed bug `battery.ischarging()` for macOS |
+| 3.37.2         | 2018-02-15     | fixed bug `battery().percent` for macOS |
+| 3.37.1         | 2018-02-13     | fixed bug `battery().ischarging` for macOS |
 | 3.37.0         | 2018-02-11     | extended FreeBSD support `networkStats()` |
 | 3.36.0         | 2018-02-11     | extended FreeBSD support `networkConnections()` |
 | 3.35.0         | 2018-02-11     | extended FreeBSD support `processLoad()` |
diff --git a/lib/battery.js b/lib/battery.js
index 2c514b3..eaacfff 100644
--- a/lib/battery.js
+++ b/lib/battery.js
@@ -97,24 +97,26 @@ module.exports = function (callback) {
       }
 
       if (_darwin) {
-        exec('ioreg -n AppleSmartBattery -r | egrep "CycleCount|IsCharging|MaxCapacity|CurrentCapacity";pmset -g batt | grep %', function (error, stdout) {
-          let lines = stdout.toString().replace(/ +/g, '').replace(/"+/g, '').replace(/-/g, '').split('\n');
-          result.cyclecount = parseInt('0' + util.getValue(lines,'cyclecount', '='), 10);
-          result.ischarging = util.getValue(lines,'ischarging', '=').toLowerCase() === 'yes';
-          result.maxcapacity = parseInt('0' + util.getValue(lines,'maxcapacity', '='), 10);
-          result.currentcapacity = parseInt('0' + util.getValue(lines,'currentcapacity', '='), 10);
-          let percent = -1;
-          const line = util.getValue(lines,'internalbattery', '=');
-          let parts = line.split(';');
-          if (parts && parts[0]) {
-            let parts2 = parts[0].split('\t');
-            if (parts2 && parts2[1]) {
-              percent = parseFloat(parts2[1].trim().replace('%', ''));
+        exec('ioreg -n AppleSmartBattery -r | egrep "CycleCount|IsCharging|MaxCapacity|CurrentCapacity"; pmset -g batt | grep %', function (error, stdout) {
+          if (stdout) {
+            let lines = stdout.toString().replace(/ +/g, '').replace(/"+/g, '').replace(/-/g, '').split('\n');
+            result.cyclecount = parseInt('0' + util.getValue(lines,'cyclecount', '='), 10);
+            result.ischarging = util.getValue(lines,'ischarging', '=').toLowerCase() === 'yes';
+            result.maxcapacity = parseInt('0' + util.getValue(lines,'maxcapacity', '='), 10);
+            result.currentcapacity = parseInt('0' + util.getValue(lines,'currentcapacity', '='), 10);
+            let percent = -1;
+            const line =  util.getValue(lines,'internal', 'Battery');
+            let parts = line.split(';');
+            if (parts && parts[0]) {
+              let parts2 = parts[0].split('\t');
+              if (parts2 && parts2[1]) {
+                percent = parseFloat(parts2[1].trim().replace('%', ''));
+              }
             }
-          }
-          if (result.maxcapacity && result.currentcapacity) {
-            result.hasbattery = true;
-            result.percent = percent !== -1 ? percent : 100.0 * result.currentcapacity / result.maxcapacity;
+            if (result.maxcapacity && result.currentcapacity) {
+              result.hasbattery = true;
+              result.percent = percent !== -1 ? percent : Math.round(100.0 * result.currentcapacity / result.maxcapacity);
+            }  
           }
           if (callback) { callback(result); }
           resolve(result);
diff --git a/lib/util.js b/lib/util.js
index aad4f9c..9081894 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -73,7 +73,7 @@ function getValue(lines, property, separator, trimmed) {
       const parts = lines[i].split(separator);
       if (parts.length >= 2) {
         parts.shift();
-        return parts.join(':').trim();
+        return parts.join(separator).trim();
       } else {
         return '';
       }