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If you want any batteries to last longer then put the batteries in your fridge and that helps them to last longer!!
Use an application to look at the EXIF information, which should show you the date and time that the last picture was taken.
Sounds like a battery or memory problem. Make sure the battery is charged and the storage media is installed. As a last resort, consult the troubleshooting section of the manual.
It is not usually a problem, because the batteries are built into the film pack and changed every time you change it.
The rating mAh is a measure of the amount of energy that can be stored in a battery. The higher the number, the more energy can be stored. Assuming that the batteries are the same physical size and have the same nominal voltage, there is no reason why a 1400mAh battery shouldn't be used in place of a 760mAh. The only difference is that the larger battery will last longer between charges than the smaller one.