Convert light battery to USB power?- Mtbr.com
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  1. #1
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    Convert light battery to USB power?

    Is there a cable to a typical battery light to USB power? Also what's the typical amp output for the cheaper batteries?

  2. #2
    > /dev/null 2&>1
    Reputation: Procter's Avatar
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    Sorry, are you asking about powering a USB device with a light battery? Or charging a light battery with a USB port/power source?

    For powering a USB device with a light battery, the problem is that you can't necessarily just plug in a cable to inbound port on the light, and get power out - usually there is a charging system on the light which prevents leakage (a diode basically, a one-way gate)

    For charging with a USB cable:

    Most devices (phones, mp3 players) are USB2.0 - you can read up on details here but most are 500ma-900ma @ 5v. Most USB chargers / power sources emit power in accordance with this.

    You didn't specify any particular light but the output for mountain-biking lights varies, and will not tend to be exactly what you need for USB 2.0, for example my NiteRider 1800 is 7v / 4 amps.

    So, charging a mountain bike light by USB: generally no, without a transformer. But depends on the light and the battery power rating.

    Now for charging a USB-powered light, obviously those accepts a USB power source, implying that the power rating is somewhere in the range of 500-1500ma / 5v.

  3. #3
    RAKC
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    If your looking for a way to use a battery pack for USB charger, action-led-lights.com has a adapter from magicshine to do just that.

    Packs dont have an amperage output, they have a capacity and discharge amp rating. Their ratings vary.

    And these days USB charging amps varies A LOT MORE. I have phone chargers that push 2amps to charge the phones. My droid turbo charger IIRC does more than that as it charges a 4400 or 4800mah (cant remember) internal battery from completely dead in an hour.

  4. #4
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    Thanks for the replies. I'm looking to power a small USB fan but it needs at least 2.4amps -- ideally higher. I have a Securitylng light but not sure the amp output. I don't think I'm going to bother trying to use it to power the fan with the bike light battery

  5. #5
    RAKC
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    Bike light batteries would power it no problem but not for very long using cheap chinese junk. 2.4A is nothing really for a bike light battery pack but getting a usb adapter and such to run that much current instead of a proper power bank isn't going to work well since most adapters are rated lower. Unless you make your own adapter of course.

    Sent from my XT1565 using Tapatalk

  6. #6
    > /dev/null 2&>1
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    Quote Originally Posted by bank5 View Post
    Thanks for the replies. I'm looking to power a small USB fan but it needs at least 2.4amps -- ideally higher. I have a Securitylng light but not sure the amp output. I don't think I'm going to bother trying to use it to power the fan with the bike light battery
    Ok now I gotta know. What are you trying to do?

    Handlebar fan? Keep you cool?
    Brake rotor cooling system?

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