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  1. because they're not built to allow it
  2. because some use batteries that take more power than the USB-port can provide to charge
  3. because then you'd have to have the charging circuitry in the camera, to know when the battery is charged.
  4. because batteries go warm when they're being charged. If you use an external charger, the battery gets better cooling and will last longer when compared to charging it while inside the camera.
  5. some actually do
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Q: Why don't digital cameras charge from USB while plugged in?
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