thank..

i cant put alarm for my system. i build automatic meter reading. if i put the alarm the customer know my system. this for my final year project

so what my idea i want build backup supply using rechargeable batteries. if supply off the batteries can supply the pic and if the adapter supply come back the batteries will be charge.

so can u help me.
i try find the schematic for rechargeable batteries, but cant find...

or pic can save data to the memory(Eeprom) directly.