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  1. Thread Author  Thread Author    #1  

    Post USB Chargers and the Nexus 5

    You might be wondering the same thing I was, "Can my variety of USB charging devices be used to charge the Nexus 5?"

    I have several of these things. Some plug into the wall, others to the 12 volt socket in the car. The output voltage ranges between 5.4 to 5.5 volts. In an attempt to answer this question, I did some studying of the Nexus 5 service manual (kindly supplied by an unknown person prior to the release of the N5).

    Here are my findings. Use with caution! Although I have reason to believe this manual is accurate, it may not be. Furthermore, I'm not an engineer, just a curious and resourceful techie.

    There are two integrated circuits between the voltage sources (wireless charging chip and micro USB cable) and the battery. The first integrated circuit (chip) is called an over voltage chip, the second is the battery charging chip, which charges the battery.

    Over Voltage Chip - Each voltage source (micro USB connector and wireless charging IC) has an over voltage chip between it and the battery charging chip. These protect the battery charging chip from over voltage or reverse polarity situations. The part number for this over voltage chip is MAX14670E.

    Battery Charging Chip - This chip is made by Texas Instrument and the part number is BQ24192. It has a "Volts In" spec of 3.9 to 17 vdc, and an "adjustable" "Volts Out" spec of 3.5 to 4.4. This output voltage charges the battery. The "adjustment" is designed into the device by the manufacturer and never changes. The "Volts Out" remains constant, regardless of the input voltage.

    From what I can tell, I will be able to use my USB chargers which I got with my Dell Axim X51 years ago. The Nexus 5 is replacing that Dell PDA. You can imagine my amazement of what these devices have become. I don't use the N5 as a phone, I have a $7/mo pay as you go dumb phone.

    Hopefully this information will help others.
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  2. #2  
    Haalcyon's Avatar

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    Default Re: USB Chargers and the Nexus 5

    Welcome to Android Central!

    Thanks for the informative post.
    Live long and prosper.


  3. #3  
    iamblob's Avatar

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    Default Re: USB Chargers and the Nexus 5

    Thanks for the post.

    How to do you make sure a certain USB charger is compatible? I have a LG STA-U13WR that came with my LG Quantum WP7 phone which I'd like to use on the Nexus 5. I tried it once, after reading about how charging slowly with less power was better for the longevity of a battery. The LG charger is 4.8V @ 1.0A compared to the Nexus charger at 5V @ 1.2A. Turns out it seems it makes no difference. Using the *#*#4636#*#* trick the temps and voltage levels seem the same. I'm a little concerned my charging temps and voltage near the end are around 34C and 4330mV. I read on batteryuniversity that 4.2V is the industry safe level and 4.1V is better. So mine at 4.333V seems really bad. I wonder what others are getting near the end of a charge? Could I have damaged something by using the LG charger (The WP one).
  4. #4  

    Default

    Better longevity refers to battery losing capacity slower over time, not day to day battery life. Slower charger is better in that regard, although there is people suggesting that new battery can handle faster charger with little impact on longevity.

    High voltage is bad, but it's not avoidable during charging, just make sure it doesn't stay on the charger all day.

    @T-Mobile GN3
    Last edited by clevin; 12-06-2013 at 03:48 AM.
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  5. #5  
    Haalcyon's Avatar

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    Default Re: USB Chargers and the Nexus 5

    I know this doesn't apply to everyone but, me, I tend to be phone-promiscuous. I've learned that by the time my battery would be noticably affected I'm likely going to want another device anyways.
    Live long and prosper.


  6. #6  

    Default Re: USB Chargers and the Nexus 5

    I use whatever charger I pull out of the drawer on all my Nexus devices and have not had any issues. Granted, they are all Nexus chargers though.
    Pat
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