Sam doesn't want specific answers to specific circuits. He wants universal answers that work all the time for all circuits.SAM! The only "chips" that "need" the "batteries" (usually cells, not batteries) are ones that somebody WANTED to have constant or backup power to -> for a SPECIFIC task<- !
Tell us what you want done, or what the system designer of a specific system was trying to do, and we'll say "yep, a battery (or cell) is what you'd want there!