KK Flight Controller KK2.1 keeps rebooting w/battery, but boots OK w/USB interface?

So I was trying to bind a receiver to a KK2.1 board, but for some reason, it went into some kind of reboot loop when I connect my battery. The LCD lights up and shows the HW/FW versions, then reboots.

When this started a week or so ago, someone suggested re-flashing the firmware. Okay, done- I ordered the standard USB ATMEL interface, plugged it in, and it powers up and lets me flash the firmware. I disconnected the ATMEL interface, tried powering the battery on... and the bootloop situation continued. However, when I plugged the interface back in, it boots the KK2.1 (doesn't beep, though) and I can go through the menu as needed.

Any ideas on what I should be doing?
 

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