1. brondo's Avatar
    I have this question. How the phone show a screen with "No Battery Logo" if this device isn't charge.
    09-21-2018 11:37 PM
  2. B. Diddy's Avatar
    Welcome to Android Central! Which phone? When the battery reads 0%, it's not true zero, because if a lithium battery completely discharges, it's completely dead. The battery is designed to hold a small amount of charge so that it can still be successfully recharged. That small amount of charge is enough to power the screen to show that battery icon.
    09-22-2018 01:31 AM
  3. Rukbat's Avatar
    A fully charged lithium battery of the type used in the phone is charged to about 4.35 Volts maximum (the nominal voltage is around 3,75 Volts). There's a file listing various voltages under that, and the equivalent percentage for that voltage. When the voltage gets down to about 2 Volts, it's considered to have "0% charge" on it. That doesn't mean 0 Volts. (If you try to charge a lithium battery that actually has 0 Volts coming out of it, the best that would happen would be an explosion of the size that would take your hand off. There are worse things - a detached hand can be surgically reattached.)

    So the battery has 0% charge, but about 2 Volts, and that can power the "no battery" display.

    The solution is to plug in the charger and let it sit for about 8 hours. (The battery won't even be charging for the first hour - it will be in what's called a "pre-charge" state.) But never let it get below 40% in the future. Lithium batteries are not deep-discharge batteries, and constantly dropping it below 40% will kill it quickly. (Kill to the point that it has about 0.2 Volts in it, and can't be charged any more.)

    (The proper battery for the way most people use their phones would be a gel cell, but that uses lead as the electrodes, and one with the power of the battery in your phone would weigh a couple of pounds. It would also be large. Lithium is the lightest metal at normal temperatures and a lithium polymer battery is like a bag almost filled with water - you can shape it into just about anything, including a very thin battery - both of which are wanted - users want light batteries and manufacturers want thin batteries because users want thin phones.)

    Keep the phone between 80% (stop charging when it reaches 81%) and 40% (start charging when it drops to 39%), and the battery will last a lot longer. Use GSam Battery Monitor and set the alarms to 39% low and 81% high and the app will notify you when to charge and discharge.
    B. Diddy likes this.
    09-22-2018 02:25 PM

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