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Thread: Battery LED, care, maintenance & charging issues resolution.

  1. #1
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    Battery LED, care, maintenance & charging issues resolution.

    Battery LED, Care & Maintenance

    As far as charge levels are concerned, the LED next to the power button is off when not connected to the charger, orange when charging & white when charged.

    One important thing to say is that it is not recommended that you leave your T100 permanently connected to a/c. Doing so will shorten the life of your battery. You can read the sections below for further guidance on battery care & maintenance. You will find many discussions in our T100 battery section if you wish to ask subsequent questions or debate the advice shown here.

    Charging problems with your tablet.

    We often get posts asking for help with devices that are refusing to charge. Sometimes, the solution to the problem can be as simple as using the correct charger for your device. Not all a/c chargers are the same. Just because they have a USB connection does not mean they will charge whatever tablet you own.

    So the first thing to check is that you are using the manufacturer supplied charger, or at least a charger that has the same output as the charger supplied by the manufacturer. This output can be read on the manufacturers' charger and the two important pieces of information will be the voltage and the amperage. A powered on PC USB port, for example, outputs at 5v/500ma.

    The second thing to check is that you are using the charging cable that came with your device. Third party cables (especially those without a lot of owner reviews) sometimes just don't work! Also check to see that your cable and connectors are not damaged.

    If you are happy that your charger and cable are fine, (or even if you are not sure on this point) then the third thing to do is to resolve charging issues with the tablet & keyboard seperated. Charge the tablet on its own when you are trying to resolve this sort of issue.

    The next thing to try is the trickle charge trick.

    Trickle Charging
    Lithium based batteries don't like being completely flattened. Sometimes in that condition they will not accept a charge from the regular charger until they have got a little charge in them. In order for that to happen, connecting to a 5v/500ma connection - such as a powered on (& not sleeping) PC USB port, or a low power phone charger (5v/500ma) - for 8 hours or so, then enables the device to get a charge from the regular a/c charger.

    So, the process would be...
    • Device refuses to charge (or power on) when connected to the a/c charger.
    • Using the charging cable, connect to a powered on (& not sleeping) PC USB port, or a low power phone charger (5v/500ma)
    • Leave the device connected for a minimum of 8 hours. Longer won't be any problem.
    • Reconnect the device to the a/c charger and try again
    • If that process fails, try replacing either the charger and/or charging cable


    Frequent, smaller charges are better for your battery.

    Most will be familiar with the fact that a mechanical device wears out faster with heavy use. This analogy applies well when considering the life expectancy of a battery. Given that batteries in tablet devices are not easily replaced, it is worth considering the depth of discharge (DoD) to which tablet devices are allowed to discharge as this determines the cycle count (the number of times the battery can be recharged). The shorter the discharge, the longer the battery will last. If at all possible, avoid full discharges and charge the battery more often between uses. Partial discharge with lithium based batteries is fine; there is no memory and the battery does not need periodic full discharge cycles to prolong life.

    A partial discharge reduces stress and prolongs battery life. Elevated temperature and high currents (produced when charging from a deep DoD) also affect cycle life.

    In the list below you can see that charging at around 50% DoD will mean that your battery lasts around twice as long as charging at a low DoD
    • 100% DoD - 300 to 500 charge cycles
    • 50% DoD - 1,200 to 1,500 charge cycles
    • 25% DoD - 2,000 to 2,500 charge cycles
    • 10% DoD - 3,750 to 4,700 charge cycles


    Accurate battery charge reporting (calibration).

    That said, however, occasional full recharges, perhaps once every 8-12 weeks - from around 10-20% to full - are a good idea as this enables the software reporting of the level of charge in the battery to stay accurate.

    Calibration occurs naturally by occasionally running the tablet down until the battery is fully depleted and “Low Battery” appears. The full discharge sets the discharge flag, and the subsequent recharge sets the charge flag. By establishing these two markers, the battery can calculate the state-of-charge by knowing the distance between the flags

    If you have a tablet that is not reporting full charge levels, or inaccurate charge levels, a couple of full "low battery - recharge to full" cycles will invariably resolve that issue.

    It will work best if you connect the tablet to the a/c charger and then power off the tablet. This enables the battery to charge without any need for it to maintain a powered on device. So the process would be...
    • Tablet reports "low battery"
    • Promptly finish whatever you were doing
    • Connect to the a/c charger
    • Switch on the a/c power
    • Power off the tablet until the device is fully charged



    Acknowledgements to Battery University for some of the information contained in this post.
    leeshor likes this.

    PLEASE Search for existing threads before posting a new one. Thanks.

    Your opinion matters. But should you disagree - please try not to be disagreeable

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  2. #2
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    Factual thread only. No debate. Thread closed to questions or posts. Please follow the advice & then join in one of the other threads that all cover the same, often covered ground. If none of the solutions work, you only have two final options...

    1) If under warranty, contact Asus or your retailer for a repair.
    2) If not under warranty either DIY - take the device apart and disconnect / reconnect all cables and physically check the battery for obvious signs of failure. Or contact a local tablet / PC / electronics repair specialist.

    PLEASE Search for existing threads before posting a new one. Thanks.

    Your opinion matters. But should you disagree - please try not to be disagreeable

    Forum guide - here ~~ T100 FAQs - here ~~ Cold boot - here

    Adobe Flash Player & Browser Guide here

    Master Help Guide - here ~~ FAQ malware - here ~~ FAQ e-reading - here
    Mobile OS devices personal pantheon...
    ANDROID: Doogee DG310; SGS; Huawei Y300; Motoroloa Xoom 2ME; Razr; Defy Mini; CnM Touchpad II;
    Asus TF101; Lenovo A1; Samsung Tab 2 7.0
    APPLE: iPhone 4s; iPhone 5c; iPhone 6; iPhone 7; iPad 3; iPad Mini 2; iPad Air 2 64gb
    CHROMEBOOK: HP 14-Q010sa Celeron 14 Inch 4GB 16GB Chromebook - White.

  3. #3
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    Asus have posted this potential remedy for those of you who have difficulty booting - often because the battery has flattened and your device is "confused"...

    I would also recommend the trickle charge first - undocked from the keyboard...

    1. Remove the tablet from the docking station.
    2. Remove the charger from the tablet.
    3. Press and hold the power button for 45 seconds
    4. Insert the charger and inspect the charging light.
    5. Allow the tablet still separated from keyboard to charge for at least 45 minutes
    6. Press power button for 3-5 seconds to turn the tablet on
    DKL likes this.

    PLEASE Search for existing threads before posting a new one. Thanks.

    Your opinion matters. But should you disagree - please try not to be disagreeable

    Forum guide - here ~~ T100 FAQs - here ~~ Cold boot - here

    Adobe Flash Player & Browser Guide here

    Master Help Guide - here ~~ FAQ malware - here ~~ FAQ e-reading - here
    Mobile OS devices personal pantheon...
    ANDROID: Doogee DG310; SGS; Huawei Y300; Motoroloa Xoom 2ME; Razr; Defy Mini; CnM Touchpad II;
    Asus TF101; Lenovo A1; Samsung Tab 2 7.0
    APPLE: iPhone 4s; iPhone 5c; iPhone 6; iPhone 7; iPad 3; iPad Mini 2; iPad Air 2 64gb
    CHROMEBOOK: HP 14-Q010sa Celeron 14 Inch 4GB 16GB Chromebook - White.

 

 

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