USB emergency charger for mobile phones/Iphone/Ipod & usb devices

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I used 2 li-ion rechargeable batteries in series, an LM7805, some resistors, a capacitor, a switch and a green led to build this simple emergency charger. This charger will power any USB device including Iphones and Ipods with a maximum current demand of 1A. Apple devices (Iphone/Ipod) will charge properly without maxing out the 1A limit. The next stage is to build a “step up” converter to recharge the batteries via usb.

Majority of the components, except for the batteries can be found in ATX pc power supply :).

All the electronics and the batteries fit nicely in a tin can (I have to optimize the space to close it properly, I didn’t think of that during the built)

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As you can see the emergency charger is “on” and the phone is charging (little red light on the top left and thunder symbol on the battery level of the phone)

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Here you can see the rocker switch to power on or off the charger.

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3 thoughts on “USB emergency charger for mobile phones/Iphone/Ipod & usb devices

  1. Sorry I pasted a wrong test in the previous comment:-(

    Congratulation another true DIY!! How do you charge the 2 li-ion cell when required, did you implement a kind of circuit to manage also that process?

    Cris

  2. Thanks Ccriss!I am working on a step up converter to be able to charge the batteries via usb. At the moment I am recharging them using a RC li-ion charger.

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