Electronics Repair Questions? Ask an Electronics Technician
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Your speakers, if within the 1-year warranty from Beats, will be repaired (including the replacement of the battery if necessary) for free under warranty by Beats, see this page:
I could not actually find a source for a replacement battery, so I suspect you may have to go to Beats for the replacement, though for things to be that limited would be a shame.
For a video guide to replacement (supposing a source for the battery were located), see this (and two subsequent videos):
I have to ask some forgiveness perhaps for this video, since I am not sure whether it really applies to your Pill 2.0... it may be for a different and differing model, unfortunately since it is not well labeled.