PowerFilm Solar Inc

If the internal battery is fully charged, will the solar panel remain active if a USB device is connected (ie. a second power bank)?

The solar panel only functions to charge the internal battery. If that internal battery is fully charged and does not have a load through the USB then the solar panel is effectively inactive. If you plug in something on that USB port (which puts a load on the battery), then the solar panel will work to recharge the battery.

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