Quite some time ago I inquired if anyone knew anything about the little IC =
that controls solar yard lights (yx8019 in the one at hand). No one answere=
d so I assumed no one knew. Well I have now found a spec sheet, it is in Ch=
inese but informative non the less.
For yx8019
http://www.datasheet-pdf.com/datasheetdownload.php?id=3D789092

And also, from Zetex - in English.
http://www.diodes.com/datasheets/ZXLD383.pdf

These are nifty little things, they isolate the solar cell from the battery=
 and turn on the light when dark. And all with a single NiCad. And with onl=
y one other part, a simple inductor.
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