whitmers, if you want to still use that battery holder and speaker combo, just use one of the 14500's and buy a dummy cell (avail. in the store here) and that will work. You won't get uber long run times but at the least, your battery/speaker combo will get used.
And for the record, adding on what has been stated...any 3.7V battery will work on the N.B. High mA isn't the issue, it's the voltage that would fry the board.
EDIT: I just saw in another thread that you went with the dummy cell route.
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