kramknile: we have a '96 D1 with only 55k miles... it sits around alot. Our battery goes flat regularly if the vehicle isn't driven for a few days once every 2 weeks. We have been told that the problem is the very small current draw from the alarm system (including radio) and the clock - the ECU might also have a tiny draw with the engine off. Apparently, the battery plates get "sulfated up" causing the charge to be less than optimal. Once I charge the battery, we can start and run again normally but it takes about 50 miles of driving to fully charge the battery.
A partial solution is to add a solar trickle charger which simply plugs into the cig lighter. Bought a 1.8 watt solar unit that sits on the dash (or is attached to the alpine window) at Canadian Tire for $10 - most online suppliers want $29.95 for the identical unit - I bought 3 of them. In our case, we drive less thirsty vehicles routinely and keep the Disco solely for fun - reg fuel is now $4.80 per US gallon ($5.69 per Imperial gallon) up here at the end of the world.
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