What is this extra battery? E-diff?

[mbecker7]

Hello Guys
Can anyone explain what the deal is with this smaller battery please?
My car is a V6 petrol SE.
I think it is the power supply to my E-diff, but if that was the case that would be how you could figure out wether you have a E-diff or not, so I'm confused.
There aren't any additional power supplies or anything on my car, it had not been off the black stuff when I got it a few months back. There wasn't anything non standard fitted.
I have also attached a picture of the area above my rear differential, can someone confirm that this is an E-diff please?

[Scouse]

Isn't it a fuse box?

[101RRS]

That pic only shows one battery - the main starting battery -= if you are talking about the box to the left that is the under bonnet fuse box (there is another inside the cabin.

Garry

[CaverD3]

Confused. Pic shows main battery and fuse/relay box no pic of e-diff.

[mbecker7]

Thanks guys, I didn't expect more fuses but that makes sense now.
I have added in the photo I forgot earlier.;)

[Scouse]

The extra photo appears to show the handbrake module.