Flat battery

[puppy]

I have a 97 CLK which I don't use very much and the battery has gone flat now the problem is that I can't for love nor money get my key in the boot to open it to gain access to the battery to jump start it.
Is there anyway I can jump it from under the bonnet and if so where?

 

[Cole@MBS]

Yoy can jump it from here, earth lead to chassis and put the plus lead onto the fuse shown in photo! you find this on the nearside inner wing!