I don't have a maxx I have the OG Razr. I go from 630AM to 1130 PM and have about 55-60% of my battery left at the end of the day. You certainly should be doing better. Here are a few suggestions to improve time between charges:
-Turn your display down to about 20%. If out doors you can always turn it up. Your display is normally the biggest use of battery.
-Run on 3g (CDMA only) when you aren't downloading files or browsing the web...then use WiFi or 4g. 4g is a battery hog (on any phone). By the way, YouTube and apps like that stream music and video just fine on 3g...most of the time.
-Check the widgets you have running and syncing. Weather, Facebook and other widgets that sync data all the time run down your battery. Limit the number of widgets you need and have then never sync (you initiate the sync) or have them sync once every 2 hours or something like that. The fewer widgets you have running the better off you are.
-Some people use the app SmartActions (I don't). There are a lot of threads here from users using SmartActions and how they have that app set up...check it out.
-Stay away from Task Killers...they usually eat more battery than they save and they can "screw" with with they proper operations of your phone.
It may take a day or two for your phone/battery to settle in. Recommend you let the phone drain down to about 20-30%...power off the phone and recharge to 100%. Make sure you use the provided wall charger and cable...not a replacement or one from a different phone. It does make a difference.
Hope these help
All good advice, just one clarification... When "training" the battery meter, you should FIRST charge to 100% with power off (to set the max charge flag), then you need to let the phone drain to 15% (low battery warning), rather than 20 or 30%. If you do not let it reach the level that signals low battery, the low level flag is not properly set, then charge once again to 100% with power off (which then confirms the full range of capacity to the metering system).
This three step process should be done once every 40 or so charges, or once every 1-2 months (RAZR), or every 2-3 months (RAZR MAXX).
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