1. AC Question's Avatar
    Have a Moto G3 with charging issues for the past month.

    Use it for android auto in my car which worked well but then one day it stopped charging or recognizing the car's AA. Bought new USB cables, other phones work, not the G3 anymore.

    Charge it nightly with a slow 1.2A charger which would work. One night the battery drained before I could charge it. Once it charged to 5-6% it would boot up and then turn off. Occurred 10-15 times even with trying safe mode boot up. The next morning it was off but charged to 50%.

    Since then, can't use that charger or any slow <2A chargers. I replaced the bed stand charger with 2.0A and used the same cable and it charges.

    Sometimes it shows charging symbol while it's in my pocket. With slow amp chargers it doesn't even recognize a cable is plugged in for charging.

    Don't mind most of this and a faster charger, but not being able to use Android Auto ,since my guess is the USB port is only 1A, is annoying at least.

    Any thoughts as to what's going on? Can it be fixed? I'm waiting for Pixel 2 and will likely preorder it but dunno when that will happen.
    08-30-2017 11:50 AM
  2. Rukbat's Avatar
    It sounds like that <6% discharge ruined the battery. (Lithium batteries are not deep-discharge devices. Never let the battery drain below 40%. If it gets to 40% and you can't charge it, turn the phone off.)

    You probably need a new battery.
    08-30-2017 12:44 PM
  3. Priyank C's Avatar
    40%? thats asking a lot to only use 60% of the battery. i'll try to keep it charged as mcuh as possible now knowing the reason.

    i'm still unsure why lower amp chargers and car outlets do not allow the phone to charge or even connect to the android auto system? any workaround for AA?
    08-31-2017 08:27 AM
  4. Rukbat's Avatar
    As I said, the battery is probably ruined, which is why lower capacity chargers probably aren't working.

    As for why 40% is the limit, it has to do with the chemistry that has to be used to get lithium to produce electricity. Lead-acid batteries can be discharged to flat dead, and then recharged, but a L/A battery for a cellphone would weigh a few pounds (lead is heavy, lithium is the lightest metal.)

    It's also why we don't see a lot of cars running lithium batteries. Between only getting 60% of the capacity of the battery, and dendrites (you can learn about that in some of the articles at Lithium Battery Dendrite links), the automotive industry has already spent billions, and still has no answer. So we just have to make sure we charge at 40% or turn the phone off at 40%. (Or buy a phone with a field-replaceable battery, and carry a spare to swap in as needed. I did that for years.)
    Laura Knotek and Priyank C like this.
    08-31-2017 12:17 PM
  5. chanchan05's Avatar
    You don't really have to turn off at 40%. That's paranoid level. But the advice to charge when reaching 40 is sound. Just try to not let it get below 40 when you can. Personally I turn it off at 15%. But that's rare and has happened to me only once. I always have a power bank with me.
    Laura Knotek and Priyank C like this.
    08-31-2017 12:21 PM

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