Qualcomm: Smartphone Quick Charge v5: 50% in 5 minutes

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Jul 30, 2020.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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  2. yadro

    yadro Member

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    This is a welcomed news although they have been far behind on the chinese companies like Oppo and Vivo.
    They already have 125W ready.

    Although now i think they should focus more in increasing the battery capacity rather then the charging speed.
     
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  3. Fox2232

    Fox2232 Ancient Guru

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    That's a lot of power. And a lot of current which means heat.
     
  4. sverek

    sverek Ancient Guru

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    Doesn't fast charge shortens battery lifespan?
     
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  5. Fox2232

    Fox2232 Ancient Guru

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    Depends on battery. There are batteries that can charge at 1C and those that can charge at 50C.
    Here, it is mere 6C.
     
  6. schmidtbag

    schmidtbag Ancient Guru

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    Any bets on when the first fire or exploded battery is going to happen?
     
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  7. sverek

    sverek Ancient Guru

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    Well, I mean not temperature, but battery losing it's energy storage capacity, due to fast charging degrading components, etc...
     
  8. JamesSneed

    JamesSneed Master Guru

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    Yeah that is my concern. We really need a fundamental change to lithium ion before we start thinking 100w charging in small devices like phones and tablets.
     
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  9. Embra

    Embra Maha Guru

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    Need to get off lithium in general to move forward.
     
    Last edited: Jul 30, 2020
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  10. Silva

    Silva Maha Guru

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    My main complain about batteries are their capacity, not their charge rate. But their stupid engineers keep thinning with their arses and making thinner phones with tiny batteries, wile focusing on charge times!
     

  11. Yong

    Yong New Member

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    New Realme smartphone overing 6000 mAH battery, i think other brand will follow soon.
     
  12. Fox2232

    Fox2232 Ancient Guru

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    https://www.mpoweruk.com/beginners.htm
    C there does not stand for ° of Celsius.
     
  13. D3M1G0D

    D3M1G0D Ancient Guru

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    Blame Apple for pushing mobile devices in this direction. Thankfully, many modern phones now come with bigger batteries.
     
  14. Drazen

    Drazen Member

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    Numbers do not add up. Phone battery is usually 4.2V but let say 4V for simpler calc. 100W is then 25A. This is 25Ah in 1 hour or 25/12 = 2Ah in 5 min. Of course without any losses!
    LiIon charging efficiency is around 90% (depends on battery) and we have charger efficiency also cca 90%. This gives some 1.6Ah in 5 min!
    If my math is correct that's 35%.
    Also LiIon could be fast charged only in 20 - 70% capacity range. Well marketing layers: 20% to 50% is 0.8Ah + 1.6 = 2.4 what is roughly 50% of 4500.
    USB-C support voltages up to 20V what reduces current to 5A but if this 20V comes in contact with 3V data lines... For sure I will forget any Chinese cable.
     
  15. Silva

    Silva Maha Guru

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    My P8lite2017 (bought in 2018) battery is already showing signs of age. I don't see phones having bigger batteries, I see them having bigger screens+battery to power that screen.
    Duration if a battery is still one day and some hours for a new phone.
     

  16. sverek

    sverek Ancient Guru

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  17. fry178

    fry178 Ancient Guru

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    only reason to push this is because that ppl have phones that wont have power for a whole day.
    glad your apple/samsung, has the brightest screen.. :D
     
  18. Neo Cyrus

    Neo Cyrus Ancient Guru

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    I've looked into this and I've gotten tons of contradicting information but the most credible info I can gather says yes, yes it does. And significantly so when charging to full, with the last 20%, or so, supposedly being an enormous amount of strain not worth charging to. Supposedly Samsung for years has capped their charging to 80% shown as 100% which how they can claim lower capacity loss over X amount of time.

    But that same info also points to a lot of the degradation being directly from heat due to voltage conversion being done inside the phone (WTF?) rather than the charger, and higher than optimal voltage to compensate for the low current. Oppo/OnePlus' charging which doesn't do the conversion inside the phone, and uses (or at least used to, haven't kept up) lower voltage with higher current should in theory not murderape the battery like other fast charging, particularly to 100%, does.
     
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  19. sverek

    sverek Ancient Guru

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    Yeah, those small devices got all crazy stuff in them. I know it's bad practice to fast charge car battery that is not designed for a fast charge.
    Doing so, will drastically reduce its lifespan, as well as raise lots of heat.
     
  20. Fox2232

    Fox2232 Ancient Guru

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    Li-Ion/Li-Po batteries are charged at constant voltage. What changes is current towards end of charging cycle.

    6C in nothing special today. 10 years ago, even people who dealt with larger capacity batteries were afraid to go above 1C even while manufacturer guaranteed 2C~6C. But they were not afraid to discharge entire pack in 5 minutes (12C).
    Today, Batteries are rated often 60C+. One of my older RC batteries is 5Ah and 60C, that's 300A max discharge at 7.4V rated. (8.4V at max capacity.)
     
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