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Dunno, but there are probably a few options besides draining the battery...
Set it up fully and then do a full backup to either Built-In storage or a card. The nice thing about doing it to a card is that you should be able to ( I think ) restore the same image to multiple devices.
On the 300 you have ~5mb of storage and on the 400 you have ~37mb of storage. So depending on the ammount of configuring that might work. The nice thing is that the built-in storage will not discharge and you won't have problems with the backup battery either.
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