Problem chip ds1307 with battary 3v

Using Arduino General Electronics
1

I connect the circuit as in this photo http://tronixstuff.files.wordpress.com/2010/05/ds1307exampleuse.jpg

then I connect this circuit with TFT LCD on arduino mega 2560 , but the problem when I turn off arduino the time is kept in chip but don't move , In other words, when I turn on arduino again the time Starts from the moment that turned off arduino.

2

That's weird. I'd suspect the battery or the crystal, but mostly the battery.

If the DS1307 is too far apart from the Arduino (>= 15cm), use pullup resistors in the SCA and SCL lines (4k7 ~ 10k resistors to +5V: the closer the higher the resistance)