Clip+ Refresh battery / Add power + Microsd Card Power req. + Mic

The last time I checked, replacement batteries (not from SanDisk) were available thru either eBay or AliExpress; and some might even have been of a slightly larger capacity.  But there remains the issue of actually doing the replacement, with very fragile leads.  As Tapeworm notes above, the anythingbutipod.com forum is a good source for info., including the replacement process.