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Battery while using navigation

Discussion in 'Android Devices' started by dcutts666, Jan 13, 2013.

  1. dcutts666

    dcutts666 Lurker
    Thread Starter

    While using navigation, both google maps and copilt, my car cigarette charger cannot charge the device quick enough, i use a 2.1amp usb car charger, and when i goto the battery menu it says it is charging via AC. Has anyone else experienced this and found a resolution?

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  2. Indium Indeed

    Indium Indeed Newbie

    This is quite common problem with android devices. Specially in tablets.
  3. JanComputerman

    JanComputerman Android Enthusiast

    I didn't see Google maps drawing much power by itself when I was navigating and ran it on battery power
  4. Harry2

    Harry2 Extreme Android User

    Does your N7 heat up in this situation?

    The Li-Ion battery's temperature operating range is for charging 0C (+32F) to +45C (+113F).

    So the battery it's the phone's most sensitive component.
    Therefore battery won't be charged if its temperature is above +45C (+113F) because the phone's charge controlling will project the battery.
    Therefore it'll shut down charging until the battery's temperature will meet again the charge operating range.

    I've mounted my phone over the dashboard's air outlet in order to prevent this ;)

  5. dcutts666

    dcutts666 Lurker
    Thread Starter

    It doesn't seem to heat up, i too have it fixed on a vent and even in this cold weather while driving 8 mile trip and pluged into car charger it loses 3% battery
  6. binary visions

    binary visions Android Expert

    Seems odd if it says it's charging on AC.

    There's no way it's pulling 2100mA but still discharging. That would imply that you could discharge the entire battery in 2 hours if it were unplugged, which is nuts - I'm not sure you can turn on enough stuff to drain it that fast, even if you wanted to.

    Is it an iPad car charger?
  7. dcutts666

    dcutts666 Lurker
    Thread Starter

    Its the USB cable that came with the nexus, pluged into a car cigarette usb converter, (i have tried 3 different makes of charger)
  8. Harry2

    Harry2 Extreme Android User

    You might measure the discharging amperage of the N7 while running these apps that you use when you driving, but without the charger connected.

    Battery Monitor Widget will show you the history of amperage by time in a graph.

    Your N7 won't take all of this 2.1A from the charger.

    Phones/tablets limit the amount of amperage needed.
    So the charger's ability of amperage could be bigger than the phone's/tablet's needing, but should not less.

    Smart phones limit to 1A and I guess the N7 might limit to 1.5A.
    This amperage is divided in the battery's consume to be charged and -on battery bypasses- the phone's/tablet's directly consume.

    Unfortunately, battery apps monitor only the battery's amperage current while discharging/charging and not the phone's/tablet's directly consume when be charged.

    So, the amount of amperage to which a phone/tablet limits can only correctly measured in the cable connection with ampere meter.

    At least, Battery Monitor Widget would give you an idea of the amperage consuming while your navigation apps are running on the N7 :)

    The N7's amperage limit might be shown as specs, my 9" Sony tablet shows 5V/1.5A :)

  9. Harry2

    Harry2 Extreme Android User

    A more simply approach :) ... you'd chose a microUSB cable as short as possible and with thicker power wires because of the larger amount of amperage that charging and the navigation app (at the same time) are needing.

    Quality mircroUSB cables like these by DeLock have 24AWG for the power wires instead of 28AWG like the data wire.

  10. Solutions Etc

    Solutions Etc Lurker


    The Nexus 7 requires pins 2 and 3 of the usb port on the charger to be shorted in order to draw full current from it.

    Most car chargers are NOT wired up this way.
  11. Harry2

    Harry2 Extreme Android User

    This car charger in question seems to be wired up in this way because the N7's battery menu says Charging AC ;)

  12. Solutions Etc

    Solutions Etc Lurker

    Easy enough to check using an ohmmeter.
  13. dcutts666

    dcutts666 Lurker
    Thread Starter

    Thanks, found one on amazon works great :)
  14. dcutts666

    dcutts666 Lurker
    Thread Starter

  15. gsuemnic

    gsuemnic Newbie

    Can someone provide a link for a good 2.0 -2.1 amp car charger for the Nexus 7 tablet
    Thanks a bunch
  16. dcutts666

    dcutts666 Lurker
    Thread Starter


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