1. Niv77's Avatar
    What's the best extended battery?
    Post some pics if you may
    And also the pros and cons of each.
    Thanks!
    04-18-2018 03:08 AM
  2. ansa82's Avatar
    I've heard zerolemon but I do not have one. would be interested if I could find one for V20 though
    04-18-2018 07:47 AM
  3. tickerguy's Avatar
    I've yet to see anyone here report that the claimed capacity of those actually matches what they deliver.
    04-18-2018 09:18 AM
  4. datum9's Avatar
    I have used ZeroLemon in many devices. They work very well. You get 2 days of runtime. Initially. Then after 6 months the runtime begins to slowly decline. You can keep it up to 2 years.

    A great investment, because the OEM battery is junk. The lifespan of a Li-Ion cell is about 2 years. It will still work after 2 years but at a reduced capacity.
    04-18-2018 12:53 PM
  5. datum9's Avatar
    Keeping in mind that a li-ion cell can only take so many charges, I think they are rated at about 1500 charges. I am not sure if half a charge counts as a full charge.
    04-18-2018 12:56 PM
  6. Mooncatt's Avatar
    Keeping in mind that a li-ion cell can only take so many charges, I think they are rated at about 1500 charges. I am not sure if half a charge counts as a full charge.
    With Li-ion, a partial charge counts as a partial cycle, all else being equal. But there are other factors like depth of discharge, charging to full, heat, etc that also affect overall life.

    I'm personal using an iPossible battery. It's not the full 6,700 advertised capacity (more like 5,500 or so), but it is more than the OEM battery. It makes the phone about twice as thick, but the new back plate doubles as a case and works well. My only complaint there is the volume buttons are not very well defined.

    I've tried a similar sized Perfine brand but sent it back because it was barely the same actual capacity as the OEM.
    Laura Knotek and kal_el_5011 like this.
    04-18-2018 01:15 PM
  7. dlcpa's Avatar
    anyone try Juboty?
    04-18-2018 02:49 PM
  8. tickerguy's Avatar
    Keeping in mind that a li-ion cell can only take so many charges, I think they are rated at about 1500 charges. I am not sure if half a charge counts as a full charge.
    Rated life for the base chemistry (there are several Lithium chemistry combinations for batteries) is ~500 cycles. A cycle is 10% to 100% and back, but this assumes actual proper charge protocols are followed and exactly NONE of the cellphone manufacturers do so because it takes far too long compared against what customers expect.

    You're lucky to get 250 cycles which, given that most people don't actually drain their batteries all the way every day, winds up being somewhere around 2 years. If you're a heavy user and actually DO drain the cell every day or most days (or need to top up mid-day) you're odds on to have it die after about a year either because capacity will be down enough for you to find it unacceptable or the cell will develop high resistance and the phone will start shutting off when it claims to have 30-40% or more power remaining because it cannot deliver current although the voltage is still within spec.

    The best means of extending this is to only charge to 80%; use something like Accubattery to alert you to unplug at an 80% charge level and DO NOT charge the phone overnight. This should at least double your cell life, albeit at the price of losing 20% of runtime between charges.
    04-19-2018 08:15 AM
  9. datum9's Avatar
    The thing with removable batteries, it's not a big deal to discard one after a year of usage and get another one.
    04-19-2018 04:55 PM
  10. datum9's Avatar
    You have to find the balance between number of cycles and the depth of discharge. It's not good to discharge and it's not good to charge to 4.35V.

    There is no %, the percent is just an approximate. A more precise figure is voltage, a Li-ion batteris full at 4.35V and dead at 3.5V. 80% is really 4.0V. So aiming for 4.0 to 4.1V is really the ideal.

    Charging a cell to 4.2v will give it a life of about 300 cycles.
    Charging a cell to 4.1v will give it a life of about 1000 cycles.

    his chart is simply a guide to use voltages to determine how full a Li-Ion cell is.

    4.2V = 100%
    4.1V = about 90%
    4.0V = about 80%
    3.9V = about 60%
    3.8V = about 40%
    3.7V = about 20%
    3.6V = empty
    < 3.5V = overdischarged
    04-19-2018 04:57 PM

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