1. Are you ready for the Galaxy S20? Here is everything we know so far!
    Android Police: This RAVPower USB-C power bank packs 26,800mAh and three ports for $50 ($10...
    [​IMG]

    Running out of power when you're on the go can be a real pain, but this RAVPower external battery has got you covered: It can charge a variety of devices thanks to its three ports and high capacity. It usually sells for $60, but you can now get it for $10 off on Amazon.

    [​IMG]
     
  1. dontpanicbobby

    dontpanicbobby 100% That Guy
    VIP Member

    Did the colored girls go?
     
  2. Unforgiven

    Unforgiven ...eschew obfuscation...
    Moderator

    Is it still 27,000mA the limit to carry on a plane?
     
  3. dontpanicbobby

    dontpanicbobby 100% That Guy
    VIP Member

    Seriously @Unforgiven There is a limit for powerbanks on planes?
    I take buses. No limits
     
  4. Unforgiven

    Unforgiven ...eschew obfuscation...
    Moderator

  5. dontpanicbobby

    dontpanicbobby 100% That Guy
    VIP Member

    That's plenty of charges. Whew.
     
  6. Unforgiven

    Unforgiven ...eschew obfuscation...
    Moderator

    If you are only doing a phone. With USB-C my wife and son's chromebooks use that to charge, so it may not go as far as you think. That said, I have a pile of 10,000mA ones and I have plenty to get through a flight (note: the aggregate amount you can carry is 27,000mA so you can't carry 3 10,00mA chargers).
     
  7. dontpanicbobby

    dontpanicbobby 100% That Guy
    VIP Member

    Too much power man. Are you traveling half way round the world and back. This world?
     
  8. dontpanicbobby

    dontpanicbobby 100% That Guy
    VIP Member

    TOT:My nephew isn't home.
     
  9. Bearsyzf

    Bearsyzf Android Expert

    That's Bogus man , really ?
     
  10. Hadron

    Hadron Smoke me a kipper...
    VIP Member

    I have a power bank of that capacity, and have found it useful on occasions.

    But to work out how much power it really represents, the first thing to remember is that it's the stored energy (just under the legal limit of 100 Wh) that matters, not the stored current. For example, my laptop's battery has a current capacity of 4900 mAh, which sounds like the power bank has 5.5 times the capacity. But energy = charge*voltage, and the laptop battery capacity is measured at a much higher voltage than the power bank, so actually the power bank only contains 1.5 times the energy of the laptop.

    Then consider that charging a battery is not 100% efficient: when a battery gets hotter during charging or use that's energy being wasted. The conversion from the lithium cell's voltage (around 3.7 V) to the phone's charging voltage (typically 5V) is also not 100% efficient. And then there are other losses, even from the cable. The net result is that effectively the usable energy of the power bank is about 2/3 of the capacity.

    So put them together and that 26,800 mAh power bank can actually only charge my laptop once. And rather than charging my 2,700 mAh phone 10 times it would realistically do about 6 charges. Or maybe a couple for my tablet and a couple for my phone. And if you look at it that way it's certainly more than you need to carry every day, but far less unreasonable on longer trips.
     
    dontpanicbobby and Unforgiven like this.
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