I just got an iphone 4s and when im in the house or low light places my front camera have a red effect, i mean the screen turn red, all its red...but if i shake a little the phone, it come to normal. If i turn on the front camera when im outside, it doesnt have any problem, its perfect. It has ios 8.1.3 and i dont want to update because it runs perfect, no lag, no glitchs. Can someone help me with the camera problem? And i want to know if for an 3-4 years old iphone 4s, 5-6 hours of battery (with medium-heavy use) is good or i need to change it. Thanks.
Here are 2 screenshots with in front camera:


Here are 2 screenshots with in front camera:


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