Hi Dima,

Can I suggest Flash memories ?

E.g. I use Atmels AT29C512.

Since I use it, I can store data secure,
Also its 3 byte write enable command give very high
security against unexpected altering data during power off
and power on.
Then I need no longer a lot of supervisor hardware and
not such terrible devices, which can explode or
corrosive the pcb and with only small lifetime, like batteries.
I have seen some of destroyed batteries to be sure, its really
a time bomb inside your gadget.
So on using batteries you must place they in a
separate chamber far from the pcb.


Regards,
Peter