As soon as the camera acts different form what you expect, you can "reset" any software problem, by switching off, removing the battery and memory card and then reinserting both and switching on again.
When you remove the battery, check it the contacts are clean and shiny. Do the came for the memory card. Use a bright light and eventually a magnifying glass to look in the camera, to the contacts there.
You can clean contacts with a dry cloth or cotton swabs. Never use anything sharp in or close to a camera.
If you have a multimeter, or know someone who has, you could try to measure the voltage of the battery, to make sure you still can trust it.
The LI-50B is a 3,7 Lithium Ion battery and should deliver 3,7 volt to the camera.
When you try to measure the voltage with a multimeter (Set it to DC), it should read at least 3,8 volt. If it is less, you can assume the battery won't work as soon as you put it in the camera.
on May 14, 2014