Small but Mighty Charger Juices Tablets and Jump-Starts Cars

Discussion in 'Travel Technology' started by legalalien, Apr 25, 2014.  |  Print Topic

  1. legalalien
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    legalalien Gold Member

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    From WIRED:

    Like Bluetooth speakers, a flood of portable gadget chargers gets released into the world every week. But with the exception of their color schemes and current specs–1-amp chargers for phones, 2-amp chargers for iPads and other tablets–they all do pretty much the same thing.

    Not the Juno Power Jumpr. This blue brick may look like a lot of other chargers out there, but it’s powerful enough to juice up your phone, tablet…or car.

    Yes, in a pinch you can use the Jumpr to jump-start your auto. The 6000 mAh, cell-phone-sized charger is capable of delivering a 12-volt, 300-amp output from a dedicated port. It comes with a jumper-cable attachment, and the cable has a built-in chip designed to prevent reverse charging of the Jumpr’s lithium-polymer cell. According to Juno Power, the Jumpr should work with four- and six-cylinder engines, but its 300-amp output may not be enough to turn over a V8.

    More here: http://wrd.cm/1jL4npu
     
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  2. gregm

    gregm Gold Member

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    Holy kilowatt, Batman!
     
  3. FlyingBear
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    FlyingBear Silver Member

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    gregm and MX like this.
  4. MX

    MX Gold Member

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    The picture in that link is worth more than 1000 marketing claims. There's no way to pass 300A through those flimsy wires without melting them. :D
     
  5. FlyingBear
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    FlyingBear Silver Member

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    I saw this comment elsewhere, I am not sure why people believe that. Without stripping away insulation, you can't say how different the wiring is between this device and a typical jump start system, but even assuming 6-gauge copper wire at 3 feet, you are only dissipating 0.3 watt of power in the wires. The real big challenge is at the connector level in the device, but even then it's easy enough to design the board to dissipate a few watts of power and as this is a short burst use type of device, there won't even be time for heat to build-up within the device. So everything is just fine.
     
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  6. FlyingBear
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    FlyingBear Silver Member

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    Wrong topic?
     

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