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  1. #1
    Senior Member Winfried's Avatar
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    Big, external battery to power cellphone over USB?

    Hello

    I don't know much about the field, and would like to use my Samsung Galaxy Nexus for week-end getaways.

    Problem is, even using offline maps + routes (ie. with no cellphone connection) and just relying on GPS eats batteries.

    The original came with a 3.7 Volt Li-Ion 1850mAh battery. I know there are bigger batteries, but 1) they're a bit thick, and 2) probably won't provide enough power to last a whole day.

    So I was wondering if there were external, big batteries that could power the device over the USB cable for a couple of days?

    Thank you.

  2. #2
    I am a caffine girl colleen c's Avatar
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    Get an External portable USB power pack so that you can plug in your OEM cable into the battery. Just make sure the pack you get can handle the requirement for the charge current. Amazon has some packs that are rated to 10000 mah and capable of providing up to 3A charge current. I have several of these and they work great. Search Amazon for "External USB battery".

    http://www.amazon.com/Lightning-Sens...al+usb+battery

  3. #3
    Senior Member Winfried's Avatar
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    This article was just posted on the very subject:

    "Portable chargers for cyclists"
    http://www.londoncyclist.co.uk/porta...-for-cyclists/

  4. #4
    Senior Member Winfried's Avatar
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    Thanks for the tip about the AnkerŪ Astro3E.

  5. #5
    Senior Member robert schlatte's Avatar
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    http://www.newegg.com/Product/Product.aspx?Item=N82E16875993554


    Here is the external battery that I recently purchased for $40. It seems to have a lot of power.

  6. #6
    Senior Member Winfried's Avatar
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    Looks good too. Thanks

  7. #7
    Senior Member tpolley's Avatar
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    i've heard of people taking those old bicycle light dynamo's that are driven by the wheel and converting them to charge usb devices. i wonder how reliable that would be?

    i've also seen a few dynamos that are driven by the bicycle chain. i haven't seen any reviews on them.

    you would still need some sort of battery in line with either dynamo, but you would get more power than a solar cell.

    i wonder how much drag that would cause when you're pedaling, if you'd even notice it?

  8. #8
    coprolite fietsbob's Avatar
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    Friend has a battery, same size as the phone it runs..

    you feel you have to run it continuously for 9 hours?

  9. #9
    Senior Member Winfried's Avatar
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    Quote Originally Posted by fietsbob View Post
    you feel you have to run it continuously for 9 hours?
    Yes, because I want to keep an application (Strava? Other?) running to record the trip, which requires using GPS the whole time.

  10. #10
    Rod & Judy gracehowler's Avatar
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    There is a great, long, comprehensive article about this on crazyguy: http://www.crazyguyonabike.com/doc/?...c_id=9258&v=mE, a very good read
    Rod

  11. #11
    Senior Member Winfried's Avatar
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    Thanks Rod

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