Hi Aaron, what about a SRAM with internal battery backup, like the M48Txx from SGS-Thomson. This RAM has an internal RTC and is non volatile, because of the internal battery. Aaron wrote: > I am looking for a simple battery backup solution for a project >involving an RTC. I would like to keep the clock running should power, >normally >derived from an AC to DC converter, be interrupted. I have no experience >in >battery charging/backup designs. Could someone point me in the right >direction, >preferably towards a design available on the internet? ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com