Will I be able to watch my VCD and DIVX cds?

No, just DVD, DVD+R, DVD+RW, DVD-R, DVD-RW, CD, CD-R, CD-RW, MP3 and JPEG CDS

Can I connect my DVD player to the TV?

Yes, you can do this by using the composite a/v outputs

Can I connect another device (camera, videogame, etc)  to the player ?

Yes, you can do this by using the a/v inputs

What is the lifetime of the battery?

Up to 3 hours.

How long do I have to charge the battery for the very first time?

The battery should be charged for at least 10 hours the first time.

Will I be able to play my region 3 DVDs?

Unfortunately you won’t , this DVD player is only compatible with Zone 1 DVDs.

Will I be able to play my 4:3 aspect DVDs?

Yes, you can choose to watch it stretched to the sides or without stretching the image, with 2 black bars on the sides. It is recommended to play 16:9 DVDs so the picture won't be stretched.