It most definitely has two batteries, the camera takes a button cell LR44 or similar and the flash takes 1xAA battery. You may be mistaking the A11(the one I have) flash with the A1L which had a built in, non replaceable battery.
@keval started
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It most definitely has two batteries, the camera takes a button cell LR44 or similar and the flash takes 1xAA battery. You may be mistaking the A11(the one I have) flash with the A1L which had a built in, non replaceable battery.