Hello all,
I have a2004 DiscoII, it was running great until a month ago. Now, I have a battery drain that is driving me crazy. First thing that happened is the battery in my key fob died. So I changed the battery, not problems..Ya, RIGHT!!! After changing the battery in my key fob, the battery died. So not knowing any better, I went an replace the battery. Now, I have something draining my battery. I had the alternator tested. I also Charged the battery and locked and unlocked the door with the key three times...nothing,,,still something is draining the battery. I have also started the rover so that the key is re-ignited with the computer again.
Still nothing works. The battery is being drained within 2-3hours. Does anyone have any ideas.

 

That's a big draw to drain a battery in 3 hours.

How to Find a Parasitic Battery Drain: 9 Steps (with Pictures)

only thing i would recommend to do differently is don't just disconnet the battery. Make sure the meter is setup and slide the post off the battery,. Long story short, the circuit should never be disconnected.

 

Interstate Group 27. Heaviest battery of all the batteries. Lots of extra reserve capacity. Fits in the original hole without pushing the tie rod up against the frame. $140

I run a farm so I have lots of equipment to maintain plus 4 discos and 3 other cars and I am a fairly old guy who has seen alot of batteries come and go. Interstate brand is all that I use.