Battery questions for MacBook Air 11 inch

I generally have my MBA 11 inch connected to the power supply during the day and therefore it shows 100% when I close the lid at the end of the day.
After overnight the battery shows 95% or less when I open in the morning.
Is this normal ?
Clearly not a big issue , I'm just learning the best practices with this, the first MAC I have ever owned.
Why the **** didn't I buy one years ago ? Wonderful product !!
Since I leave it connected to a power supply most of the time, I understand that approx once monthly, I should use it on battery and fully discharge it then recharge.
Correct ?
Thx Learned MAC users for your help.
-d-

Since I leave it connected to a power supply most of the time, I understand that approx once monthly, I should use it on battery and fully discharge it then recharge.
Correct ?
Yes, that is correct. Also, if you can use it on battery power a few times a week for a few hours then plug it back in to keep the juices flowing.  http://www.apple.com/batteries/notebooks.html

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    EtreCheck version: 2.1.8 (121)
    Report generated 8 Mar 2015 11:59:02 CET
    Download EtreCheck from http://etresoft.com/etrecheck
    Click the [Click for support] links for help with non-Apple products.
    Click the [Click for details] links for more information about that line.
    Hardware Information: ℹ️
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        Flip4Mac WMV  [Click for support]
        Growl  [Click for support]
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        SwitchResX  [Click for support]
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        Skip System Files: NO
        Mobile backups: OFF
        Auto backup: NO - Auto backup turned off
        Volumes being backed up:
            Macintosh HD: Disk size: 120.11 GB Disk used: 73.65 GB
        Destinations:
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            Total size: 1.00 TB
            Total number of backups: 7
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            Last backup: 2015-02-21 16:37:24 +0000
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             6%    WindowServer
             1%    coconutBattery
             0%    Google Chrome
             0%    AppleSpell
             0%    fontd
    Top Processes by Memory: ℹ️
        241 MB    Safari
        133 MB    ocspd
        128 MB    com.apple.WebKit.WebContent
        112 MB    Google Chrome
        86 MB    mds_stores
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        1.82 GB    Active RAM
        1.20 GB    Inactive RAM
        1.07 GB    Wired RAM
        1.06 GB    Page-ins
        41 KB    Page-outs
    Diagnostics Information: ℹ️
        Mar 8, 2015, 11:54:35 AM    Self test - passed
        Mar 5, 2015, 09:33:23 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/iTunes_2015-03-05-213323_[reda cted].crash
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    Problem description:
    erratic battery behaviour since last update. Tells me to replace now, and when I unplug charger, it shuts down. Keeps switching between charging/no problems and not charging/replace now. Battery was installed in january.
    EtreCheck version: 2.1.8 (121)
    Report generated 8 Mar 2015 11:59:02 CET
    Download EtreCheck from http://etresoft.com/etrecheck
    Click the [Click for support] links for help with non-Apple products.
    Click the [Click for details] links for more information about that line.
    Hardware Information: ℹ️
        MacBook Air (11-inch, Mid 2011) (Technical Specifications)
        MacBook Air - model: MacBookAir4,1
        1 1.6 GHz Intel Core i5 CPU: 2-core
        4 GB RAM Not upgradeable
            BANK 0/DIMM0
                2 GB DDR3 1333 MHz ok
            BANK 1/DIMM0
                2 GB DDR3 1333 MHz ok
        Bluetooth: Old - Handoff/Airdrop2 not supported
        Wireless:  en0: 802.11 a/b/g/n
        Battery Health: Normal - Cycle count 59
    Video Information: ℹ️
        Intel HD Graphics 3000 - VRAM: 384 MB
            Color LCD 1366 x 768
    System Software: ℹ️
        OS X 10.10.2 (14C109) - Time since boot: 0:3:50
    Disk Information: ℹ️
        APPLE SSD SM128C disk0 : (121,33 GB)
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            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
            Macintosh HD (disk1) / : 120.11 GB (46.46 GB free)
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                Core Storage: disk0s2 120.47 GB Online
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        [loaded]    com.adobe.SwitchBoard.plist [Click for support]
        [loaded]    com.google.keystone.daemon.plist [Click for support]
        [loaded]    com.macpaw.CleanMyMac2.Agent.plist [Click for support]
        [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
        [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
        [loaded]    com.oracle.java.JavaUpdateHelper.plist [Click for support]
        [loaded]    com.sonos.smbbump.plist [Click for support]
        [loaded]    com.virtualock.VirtuaLockHelper.plist [Click for support]
        [not loaded]    org.eyebeam.SelfControl.plist [Click for support]
    User Launch Agents: ℹ️
        [loaded]    com.adobe.ARM.[...].plist [Click for support]
        [failed]    com.facebook.videochat.[redacted].plist [Click for support] [Click for details]
        [running]    com.hp.printerAgent.plist [Click for support]
        [not loaded]    com.macpaw.CleanMyMac.helperTool.plist [Click for support]
        [loaded]    com.macpaw.CleanMyMac.volumeWatcher.plist [Click for support]
        [loaded]    com.macpaw.CleanMyMac2Helper.scheduledScan.plist [Click for support]
        [loaded]    com.macpaw.CleanMyMac2Helper.trashWatcher.plist [Click for support]
        [running]    com.spotify.webhelper.plist [Click for support]
    User Login Items: ℹ️
        iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
        WDDriveUtilityHelper    Application  (/Applications/WD Drive Utilities.app/Contents/WDDriveUtilityHelper.app)
        WDSecurityHelper    Application  (/Applications/WD Security.app/Contents/Resources/WDSecurityHelper.app)
        Google Chrome    Application Hidden (/Applications/Google Chrome.app)
    Internet Plug-ins: ℹ️
        Flip4Mac WMV Plugin: Version: 3.1.0.24   - SDK 10.8 [Click for support]
        FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
        AdobeAAMDetect: Version: AdobeAAMDetect 1.0.0.0 - SDK 10.6 [Click for support]
        Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
        AdobePDFViewer: Version: 10.1.1 [Click for support]
        Default Browser: Version: 600 - SDK 10.10
        QuickTime Plugin: Version: 7.7.3
        CitrixICAClientPlugIn: Version: 11.8.2 - SDK 10.7 [Click for support]
        SharePointBrowserPlugin: Version: 14.1.3 - SDK 10.6 [Click for support]
        Silverlight: Version: 5.1.20125.0 - SDK 10.6 [Click for support]
        JavaAppletPlugin: Version: Java 8 Update 25 Check version
    Safari Extensions: ℹ️
        AdBlock
        Pin It Button
    3rd Party Preference Panes: ℹ️
        Flash Player  [Click for support]
        Flip4Mac WMV  [Click for support]
        Growl  [Click for support]
        Java  [Click for support]
        SwitchResX  [Click for support]
    Time Machine: ℹ️
        Skip System Files: NO
        Mobile backups: OFF
        Auto backup: NO - Auto backup turned off
        Volumes being backed up:
            Macintosh HD: Disk size: 120.11 GB Disk used: 73.65 GB
        Destinations:
            My Passport [Local]
            Total size: 1.00 TB
            Total number of backups: 7
            Oldest backup: 2013-11-09 23:41:49 +0000
            Last backup: 2015-02-21 16:37:24 +0000
            Size of backup disk: Excellent
                Backup size 1.00 TB > (Disk size 120.11 GB X 3)
    Top Processes by CPU: ℹ️
             6%    WindowServer
             1%    coconutBattery
             0%    Google Chrome
             0%    AppleSpell
             0%    fontd
    Top Processes by Memory: ℹ️
        241 MB    Safari
        133 MB    ocspd
        128 MB    com.apple.WebKit.WebContent
        112 MB    Google Chrome
        86 MB    mds_stores
    Virtual Memory Information: ℹ️
        201 MB    Free RAM
        1.82 GB    Active RAM
        1.20 GB    Inactive RAM
        1.07 GB    Wired RAM
        1.06 GB    Page-ins
        41 KB    Page-outs
    Diagnostics Information: ℹ️
        Mar 8, 2015, 11:54:35 AM    Self test - passed
        Mar 5, 2015, 09:33:23 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/iTunes_2015-03-05-213323_[reda cted].crash
        Mar 5, 2015, 07:35:39 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/com.apple.WebKit.Networking_20 15-03-05-193539_[redacted].crash

    Hi Dominic,
    Thank you for your help! I did all three things and run etrecheck again. It now shows the following, different things seem to be failing now? Like Kerberos?
    Problem description:
    EtreCheck version: 2.1.8 (121)
    Report generated 8 Mar 2015 12:57:52 CET
    Download EtreCheck from http://etresoft.com/etrecheck
    Click the [Click for support] links for help with non-Apple products.
    Click the [Click for details] links for more information about that line.
    Hardware Information: ℹ️
        MacBook Air (11-inch, Mid 2011) (Technical Specifications)
        MacBook Air - model: MacBookAir4,1
        1 1.6 GHz Intel Core i5 CPU: 2-core
        4 GB RAM Not upgradeable
            BANK 0/DIMM0
                2 GB DDR3 1333 MHz ok
            BANK 1/DIMM0
                2 GB DDR3 1333 MHz ok
        Bluetooth: Old - Handoff/Airdrop2 not supported
        Wireless:  en0: 802.11 a/b/g/n
        Battery Health: Normal - Cycle count 59
    Video Information: ℹ️
        Intel HD Graphics 3000 - VRAM: 384 MB
            Color LCD 1366 x 768
    System Software: ℹ️
        OS X 10.10.2 (14C109) - Time since boot: 0:8:11
    Disk Information: ℹ️
        APPLE SSD SM128C disk0 : (121,33 GB)
            EFI (disk0s1) <not mounted> : 210 MB
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
            Macintosh HD (disk1) / : 120.11 GB (46.30 GB free)
                Encrypted AES-XTS Unlocked
                Core Storage: disk0s2 120.47 GB Online
    USB Information: ℹ️
        Apple Inc. FaceTime Camera (Built-in)
        Apple Inc. BRCM20702 Hub
            Apple Inc. Bluetooth USB Host Controller
        Apple Inc. Apple Internal Keyboard / Trackpad
    Thunderbolt Information: ℹ️
        Apple Inc. thunderbolt_bus
    Gatekeeper: ℹ️
        Anywhere
    Kernel Extensions: ℹ️
            /System/Library/Extensions
        [not loaded]    com.Ralink.driver.RT2870USBWirelessDriver (4.1.8) [Click for support]
        [not loaded]    com.marvell.kext.USBGenericPrinterClass (1.0.0) [Click for support]
    Problem System Launch Daemons: ℹ️
        [failed]    com.apple.Kerberos.kdc.plist [Click for details]
    Launch Agents: ℹ️
        [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
        [failed]    com.adobe.CS5ServiceManager.plist [Click for support] [Click for details]
        [loaded]    com.citrix.AuthManager_Mac.plist [Click for support]
        [running]    com.citrix.ReceiverHelper.plist [Click for support]
        [running]    com.citrix.ServiceRecords.plist [Click for support]
        [loaded]    com.google.keystone.agent.plist [Click for support]
        [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
    Launch Daemons: ℹ️
        [loaded]    com.adobe.fpsaud.plist [Click for support]
        [loaded]    com.adobe.SwitchBoard.plist [Click for support]
        [loaded]    com.barebones.authd.plist [Click for support]
        [loaded]    com.google.keystone.daemon.plist [Click for support]
        [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
        [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
        [loaded]    com.oracle.java.JavaUpdateHelper.plist [Click for support]
        [loaded]    com.sonos.smbbump.plist [Click for support]
        [loaded]    com.virtualock.VirtuaLockHelper.plist [Click for support]
        [not loaded]    org.eyebeam.SelfControl.plist [Click for support]
    User Launch Agents: ℹ️
        [loaded]    com.adobe.ARM.[...].plist [Click for support]
        [failed]    com.facebook.videochat.[redacted].plist [Click for support] [Click for details]
        [running]    com.hp.printerAgent.plist [Click for support]
        [not loaded]    com.macpaw.CleanMyMac.helperTool.plist [Click for support]
        [not loaded]    com.macpaw.CleanMyMac.volumeWatcher.plist [Click for support]
        [running]    com.spotify.webhelper.plist [Click for support]
    User Login Items: ℹ️
        None
    Internet Plug-ins: ℹ️
        Flip4Mac WMV Plugin: Version: 3.1.0.24   - SDK 10.8 [Click for support]
        FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
        AdobeAAMDetect: Version: AdobeAAMDetect 1.0.0.0 - SDK 10.6 [Click for support]
        Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
        AdobePDFViewer: Version: 10.1.1 [Click for support]
        Default Browser: Version: 600 - SDK 10.10
        QuickTime Plugin: Version: 7.7.3
        CitrixICAClientPlugIn: Version: 11.8.2 - SDK 10.7 [Click for support]
        SharePointBrowserPlugin: Version: 14.1.3 - SDK 10.6 [Click for support]
        Silverlight: Version: 5.1.20125.0 - SDK 10.6 [Click for support]
        JavaAppletPlugin: Version: Java 8 Update 25 Check version
    Safari Extensions: ℹ️
        AdBlock
        Pin It Button
    3rd Party Preference Panes: ℹ️
        Flash Player  [Click for support]
        Flip4Mac WMV  [Click for support]
        Growl  [Click for support]
        Java  [Click for support]
        SwitchResX  [Click for support]
    Time Machine: ℹ️
        Skip System Files: NO
        Mobile backups: OFF
        Auto backup: NO - Auto backup turned off
        Volumes being backed up:
            Macintosh HD: Disk size: 120.11 GB Disk used: 73.81 GB
        Destinations:
            My Passport [Local]
            Total size: 1.00 TB
            Total number of backups: 7
            Oldest backup: 2013-11-09 23:41:49 +0000
            Last backup: 2015-02-21 16:37:24 +0000
            Size of backup disk: Excellent
                Backup size 1.00 TB > (Disk size 120.11 GB X 3)
    Top Processes by CPU: ℹ️
             6%    WindowServer
             0%    fontd
             0%    AppleSpell
             0%    notifyd
             0%    net.zeo.space.osx.helper
    Top Processes by Memory: ℹ️
        249 MB    Safari
        220 MB    com.apple.WebKit.WebContent
        116 MB    Finder
        112 MB    mds_stores
        69 MB    ocspd
    Virtual Memory Information: ℹ️
        554 MB    Free RAM
        1.61 GB    Active RAM
        1.06 GB    Inactive RAM
        1.07 GB    Wired RAM
        945 MB    Page-ins
        0 B    Page-outs
    Diagnostics Information: ℹ️
        Mar 8, 2015, 12:49:20 PM    Self test - passed
        Mar 5, 2015, 09:33:23 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/iTunes_2015-03-05-213323_[reda cted].crash
        Mar 5, 2015, 07:35:39 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/com.apple.WebKit.Networking_20 15-03-05-193539_[redacted].crash

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