That looks like the back up battery for a tracker. Do you have a tracker fitted and subscribed to ? I am 99.9% sure thats what that is from the picture. The battery is there to give the tracker unit power if the car is stolen and the main car battery is disconnected.
Hope that clears it up
Cheers
Steve
X5 3.0i Topaz Blue , Paddle shift steering wheel , Pioneer double din sat nav,Alpine speaker upgrade, Remap, HID's,20inch lemans alloys,lemans arch kit,Depo light kit,carbon fiber interior wrap.
1989 BMW 325i SPORT E30 Fully equiped summer toy.
[quote=""bullethead""]Yeah thats a fact No tracker that i'm aware of ,well at least not that the bloke in the caravan site I bought it off told me about.... [/quote]
LOL
2004 4.4 Sport Black with Black
1998 Suzuki TL1000R, power commander, ART cans, K & N, TRE