Hi Dan,
Thanks for reply...do internal battery need charging, how long do they
last??
Thanks
You'll have better luck with a question like this if you actually use the
other side of google - the web search.
Try various things in the search box, like "Real Time Clock Batteries" or
whatever search phrase you want to make up - you will be amazed at what's
already out there.
Admittedly, that's a lot colder and less fun than interacting with actual
real live people, but huff! This is the sci.electronics.design group, not
the sci.electronics.basics group, so we're all insufferable arrogant prigs
who mercilessly flame anyone who asks an impertinent question.
<pause for audience laughter>
Was everybody able to discern that that was a joke? ;-)
But in answer to your question, the only honest answer is, as usual, "It
Depends."
Good Luck!
Rich