Sure I do have the diode you mention but not the LM336Z 2.5v. No worry I will get that as well. And thank for the charging circuit, looks complicated to me, I hope I have no problem layout them out lol.Here is what I think will work, do not know if or when I'll put it on a breadboard. Still missing is the boost, lots of chips and inf around or we scn roll ower own. Note that it is on full time except when battery is low or night. Really short on part #, mine are mostly surface mount, in an earlier post believe a suitable P-ch FET was listed, you have comparators, diodes ,plain 1N914 or equiv., shottky, 30V, 1A , V ref- LM 336Z, 2.5V. Variable resistors best if multi-turn. 9 V battery is to allow high drive for U5, good for shelf life a beyond. Looks like I had wrighters cramps & did not lable diodes- for another day. Maybe we'll get some help!!