-Amazon sells 12V 12Ah gel cells for about $30, such as ExpertPower EXP12120
+replace USB connector with a version that has actual slow primitive (which
+means moving to latest pcb-rnd 4-layer template)
+fix the short that's apparently been there a while? v_lipo to ground?
+
+possibly thermally relieve the battery negative 0.25" spade
+
+pull resistors away from through-hole LEDs to ease lead trimming