Like Tree8Likes

US-bound passengers may have to switch on mobile phones for security

Closed Thread
Page 2 of 2 FirstFirst 1 2
  1. #11

    Join Date
    Mar 2013
    Posts
    2,454

    Slightly ot but is it ok to carry external batteries in your carry on? (For an hk/uk flight, not a us one)


  2. #12

    Join Date
    May 2005
    Location
    Hong Kong, from UK
    Posts
    3,838
    Original Post Deleted
    I'm not particularly paranoid when it comes to these things, but I'd go a long way to avoid plugging my phone into a USB cable provided by airport security...

  3. #13

    Join Date
    Mar 2007
    Posts
    13,099
    Quote Originally Posted by Claire ex-ax:
    Oh so rarely visit the US these days. Can probably avoid it for some time to come. The trouble comes when other countries decide they want it too.
    I've actively avoided the US for many years now. Too much hassle to travel via or to get there. I dont care how cheap the flight is; I'll connect somewhere else, and avoid the BS.
    Quote Originally Posted by usehername:
    Slightly ot but is it ok to carry external batteries in your carry on? (For an hk/uk flight, not a us one)
    I've always carried an extra battery be it an extra laptop battery and lately a brick for charging cell phone as carry on. Never had an issue, never been questioned about it. This includes US, UK, Europe and Asian flights.
    usehername likes this.

  4. #14

    Join Date
    Oct 2006
    Location
    Sarcasm - because beating the crap out of people is illegal
    Posts
    14,622

    But we're 'told' not to fully charge them!


  5. #15

    Join Date
    Oct 2006
    Location
    Sarcasm - because beating the crap out of people is illegal
    Posts
    14,622
    Original Post Deleted
    Well it's really about prolonging the life of lithium-based batteries.

    Battery University!



    (Cadex has been recognized as a world leader in battery testing, and the advanced battery analyzers, chargers and monitoring devices the company makes are proof of this strength.)

  6. #16

  7. #17

    Join Date
    Sep 2007
    Location
    Sai Kung
    Posts
    5,854
    Quote Originally Posted by drumbrake:
    That was a foregone conclusion...

  8. #18

    Join Date
    Aug 2006
    Posts
    11,884
    Quote Originally Posted by Claire ex-ax:
    Well it's really about prolonging the life of lithium-based batteries.

    Battery University!



    (Cadex has been recognized as a world leader in battery testing, and the advanced battery analyzers, chargers and monitoring devices the company makes are proof of this strength.)
    This is pretty much at a complete tangent to the rest of the thread. I'm posting this because I have a minor hobbyist interest in batteries.

    I've been wondering for a while about this rule of thumb about keeping batteries topped up and am beginning to conclude that for at least some types of device, the this advice could be either irrelevant or incorrect.

    If take an arbitrary example of a 1000mAh cell, use the median figures of 400 life cycles and 4225 for 100% depth of discharge and 10% depth of discharge then you get:

    1000 x 400 = 400,000mAh versus
    100 x 4225 = 422,500mAh

    Which is only a 5% difference. On top of this, if you're keeping the cell stored at, or close to, 100% all the time this markedly accellerates capacity loss (from Table 3).

    So my reading of the Cadex information is that it's pretty much a wash whether you keep Li batteries topped up or whether you let them run down.
    Last edited by jgl; 14-07-2014 at 11:30 AM.