Finally, I bought the aera 500 too. It arrived last wednesday. he he.
Dypen, you can connect it to your lapto by usb to charge the battery.
When you plugit, it will be in the data transfer mode, you can remove the device from your pc in the safety mode (in spanish, quitar hardware con seguridad) and then you can use your aera while it is being charging.
At last, you can turn it off and it continues charging.
If you have any other question, say me and we can learn more about the aera.