Stealth Cam Battery Life Question?
 

I recently purchased a SC I450 and really like the picture quality. It's been in the woods for about 3 weeks. The low battery light has been on for about two weeks. But when i open up the camera the digital battery inidicator inside shows the battery being full. Does the battery inside picutre inside the camera lose its fill, like that on a cell phone or do I need to change as soon as the light on the front of the camera comes on??
Appreciate any advice!