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Thread: Mobile Phone Power Banks

  1. #1
    Join Date
    Dec 2006
    Location
    Essex, UK
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    8,647

    Default Mobile Phone Power Banks

    totally none laser related

    just got myself and the wife a power bank for our mobiles, they are awesome little devices (although I got a big one)

    it got me thinking, they only use the 18650 battery so nothing special. would you be able to buy just the electronics and make your own??
    the battery only outputs 3.7v so im guessing theres some form of dc-dc convertor to take it to 5v and then just a couple of usb connectors.

    anyone seen anything of interest on the web??

    http://www.ebay.co.uk/itm/1112528493...84.m1497.l2649

    http://www.ebay.co.uk/itm/1910929897...84.m1497.l2649
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  2. #2
    Join Date
    Nov 2007
    Location
    Sydney, Australia
    Posts
    600

    Default

    Have a look at Sparkfun or adafruit

    They both have LiPo charger/booster products but they are only for single cell batteries, not sure what it would take to modify for multicell as some sort of cell balancing circuit would be needed

    https://www.sparkfun.com/products/11231
    http://www.adafruit.com/products/280

    I'm using the Sparkfun one for my LPM (with a 5V to +-15volt DC-DC invertor)
    http://www.photonlexicon.com/forums/...840#post237840
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  3. #3
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    Default

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  4. #4
    Join Date
    Nov 2008
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    Cleveland Ohio
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    Default

    if you have iphone get a morphie

  5. #5
    Join Date
    Dec 2006
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    Default

    why would I want a shitty iphone
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  6. #6
    Join Date
    Sep 2009
    Location
    Brno, CZ / Povazska Bystrica, SK
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    491

    Default

    aren't those powerbanks heavy for carrying around? how much of the power will it recharge? isn't it better to be prepared and power up your devices at home in advance?

  7. #7
    Join Date
    Dec 2006
    Location
    Essex, UK
    Posts
    8,647

    Default

    The small ones aren't heavy they are small, they charge a phone to about 80%
    The big one I got gave 5 full charges but yes it is big and heavy, but I'm happy with that

    When at a festival you need power and when on my bike running sat nav I need power
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