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I think it is time to update this speaker with a 3S2P battery pack for a voltage of about 11.1v which should give it the longevity it deserves. The upper voltage would be 12.6v while the low voltage would be 9v. The capacity of this new pack should be about 4Ah @11.1V or 44.4Wh

Speaker Power Consumption

Power consumption recording while idle and while listening to some tunes.

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