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Tear down of a cheap external USB battery

Posted on Thursday, April 3rd, 2014 in Teardowns by DP

charger

cpldcpu did a teardown of an external USB battery:

The device has a USB micro-b socket which is used as 5V input for charging, and a normal USB-A socket as 5V output. The output power can be turned off and on by a toggle button. There are LEDs to indicate active power out (blue) and charging (red) states.
The pictures above show the innards of the device. Most space is taken up by an ICR18650 LiIon battery, which are relatively common devices with 2600mAH. In addition, there is a tiny tiny PCB.  The rear side of the PCB is dominated by a 4.7µH inductor, which is part of the boost converter to convert the 3.7V of the battery to the 5V USB output.

This entry was posted on Thursday, April 3rd, 2014 at 2:06 pm and is filed under Teardowns. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

One Response to “Tear down of a cheap external USB battery”

  1. JBeale says:

    The one I took apart had a larger PCB; I’m not sure why. It used same type 18650 battery. You can see my teardown photos by a google image search on “Tenergy Model 51038 5V”

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