Here is my smallest cmoy yet, i removed it from its case to make some changes so thought i would share some pics. Power comes from a 150ma 3.7v li-ion which is charged from mini usb followed by a high frequency voltage booster bringing it to a steady 9.3v. 2x 220uf 10v caps after the tle2426 rail splitter, 0.47uf input caps(getting replaced by 1uf) 8 pin socket for op-amp.
Low battery cutoff is built into the voltage booster but as of now that is untested. 9v battery for size reference.
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