Default Invalid Battery message

Hi

I'm french so sorry for my english, I just got my phone ... and I have a problem. When I start if, after 30 seconds it displays "invalid battery". and when I connect I have a picture with a crossed battery.

However, the battery seems to be the original

Do you know what is the problem?

Thanks for answer

evildef.free.fr/lg/IMG_20140807_183744.jpg
evildef.free.fr/lg/IMG_20140807_183848.jpg