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Step-by-step guide:

There is a "read battery level command" you can issue to the reader to check the battery status.  

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1. Connect the audio or BT VP3300 to a USB Port on the PC right before you start this process (otherwise the battery is charged up by via the USB port of the PC)
2. Launch the USDK Demo and wait for the reader to be detected 
3. You can send the F0-02 command follow the numbered steps as shown in the screenshot below:
   
4. Check the response returned in the Log window for the battery level byte (#6 in the screenshot above). If the data level >= 0xD2 indicates the Battery power full. if data level <= 0xC0 indicates Battery power low.

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What triggers the VP3300 reader change between the 3 different power modes?

What are the battery stats for a VP3300?

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